Perhaps you should try some spelling variations:
khoa sach » hoc sach
khoe sach » hoc sach, khoe sinh, hoa sach
luan tieu » luan thiet
lang tien » bang tien, lang bien, dang tien
luan dieu » lan dieu, luan hieu, cua dieu
pho gian » cho giang, ho gia, cho giao
dieu cua » dieu tra
san luan » dan luan, tang luan, hang luan
pham san » pham van, pham lan, pham can
tieu cua » thieu cua, tiep cua, bieu cua
han dieu » nhan dieu, than dieu, lan dieu
pho giao » cho giao, phong giao, phat giao
qua tiep » cua tiep, qua dieu, va tiep
tien thu » tieu thu, kien thuc, trien thi
pha san » phi san, phu san, nha san

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (( ((((pho gian) or (pho giao))) or (thoi gian)) lang tien thu ) or ((( pho cap ((qua tiep) or (qua tieu)) cua ) or ((((( pham san luan dieu cua ) or ( pha san luan tieu cua ))) or ( ((khoe sach) OR (khoa sach)) han dieu tri ))))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( ((((pho gian) OR (pho giao))) OR (thoi gian)) lang tien thu ) OR ((( pho cap ((qua tiep) OR (qua tieu)) cua ) OR ((((( pham san luan dieu cua ) OR ( pha san luan tieu cua ))) OR ( ((khoe sach) OR (khoa sach)) han dieu tri ))))))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( ((((pho gian) or (pho giao))) or (thoi gian)) lang tien thu ) or ((( pho cap ((qua tiep) or (qua tieu)) cua ) or ((((( pham san luan dieu cua ) or ( pha san luan tieu cua ))) or ( ((khoe sach) OR (khoa sach)) han dieu tri ))))))*".