Perhaps you should try some spelling variations:
hieu quan » lieu quan, thien quan, lien quan
luc tuan » luc luan, luc quan, luu tuan
nang xa » lang xa, nang ma, mang xa
cam luc » cam xuc, cau luc
chu tre » cho tre, chu tri, cuu tre
sinh y » sinh ly
anh va » hanh va
va chu » va che, va cau, va chi

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sinh y ((nang xa) OR (nang x)) hoi. ((hieu qua) or (hieu quan)) cam luc tuan anh va chu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sinh y ((nang xa) OR (nang x)) hoi. ((hieu qua) OR (hieu quan)) cam luc tuan anh va chu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sinh y ((nang xa) OR (nang x)) hoi. ((hieu qua) or (hieu quan)) cam luc tuan anh va chu tre*".