Perhaps you should try some spelling variations:
hieu quan » lieu quan, thien quan, lien quan
hoc sach » hoc sinh, hoc cac, hoc anh
chua tre » chua tri, cua tre, chua trieu
nang xa » nang x, lang xa, nang ma
luc van » luoc van, luu van, luc va
duc van » duc va, duc tan, duc manh
va chua » vua chua, ca chua, va chu
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang
anh va » hanh va

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

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