Perhaps you should try some spelling variations:
luan hieu » luan tieu, luan dieu, luan thiet
pho gian » pho giao, thoi gian, cho giang
gian van » giang van, gian dan, gian lan
hieu cua » hieu qua, dieu cua, bieu cua
dan luan » doanh luan, dung luan, tang luan
khoe dan » khoe ban, khoa dang, khoe dinh
qua tieu » luan tieu
qua dieu » cua dieu, quan dien, va dieu
tien thu » tieu thu, kien thuc, trien thi
phoi cay » nuoi cay, phoi tai, cho cay
van tien » toan tien, van hieu, van tuan
hieu tra » dieu tra, hiep tran, chieu tro
tap cua » tap quan, tiep cua
cua tap » cua tam, cua phap
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 tap cua ) or ( phoi cay ((qua dieu) OR (qua tieu)) cua ))) or ((( khoe dan luan hieu cua ) or ( khoe dan luan hieu tra ))))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( pho gian van tien thu ) OR ((((( pho cap cua tap cua ) OR ( phoi cay ((qua dieu) OR (qua tieu)) cua ))) OR ((( khoe dan luan hieu cua ) OR ( khoe dan luan hieu tra ))))))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( pho gian van tien thu ) or ((((( pho cap cua tap cua ) or ( phoi cay ((qua dieu) OR (qua tieu)) cua ))) or ((( khoe dan luan hieu cua ) or ( khoe dan luan hieu tra ))))))*".