Perhaps you should try some spelling variations:
sach luan » sach han, san luan
pho gian » pho giao, thoi gian, cho giang
tiep cua » tiep va
gian van » giang van, gian dan, gian lan
tien thu » tieu thu, kien thuc, trien thi
van tien » toan tien, van hieu, van tuan
dieu tra » dieu tri, kiem tra
cac qua » cau qua, tac quan
cay lua » vay luan
tap cua » tap quan
cap cua » cap cuu, ca cua, cau cua

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 van tien thu ) or ((((( pho ((cap cua) or (tap cua)) ((tiep cua) or (tiep can)) ) or ( phoi ((cac qua) or (cay lua)) dieu cua ))) or ((( khoe ((sach luan) OR (sach luyen)) dieu cua ) or ( khoe ((sach luan) OR (sach luyen)) dieu tra ))))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( pho gian van tien thu ) OR ((((( pho ((cap cua) OR (tap cua)) ((tiep cua) OR (tiep can)) ) OR ( phoi ((cac qua) OR (cay lua)) dieu cua ))) OR ((( khoe ((sach luan) OR (sach luyen)) dieu cua ) OR ( khoe ((sach luan) OR (sach luyen)) dieu tra ))))))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( pho gian van tien thu ) or ((((( pho ((cap cua) or (tap cua)) ((tiep cua) or (tiep can)) ) or ( phoi ((cac qua) or (cay lua)) dieu cua ))) or ((( khoe ((sach luan) OR (sach luyen)) dieu cua ) or ( khoe ((sach luan) OR (sach luyen)) dieu tra ))))))*".