Perhaps you should try some spelling variations:
hieu quan » lieu quan, thien quan, lien quan
hoc sach » hoc sinh, hoc cac, hoc anh
van nang » van quang, van ban, van dong
sach van » sach han, sach va, bach van
va hanh » van hanh, va thanh, va danh
cam luc » cam xuc, cau luc
nang xa » nang x, lang xa, nang ma
va dan » ca dan, va dao, va dau
va cua » va chua, via cua, ca cua
cua te » cua tu

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 van nang xa hoi. ((hieu qua) or (hieu quan)) cam luc ((va hanh) or (va dan)) va cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach van nang xa hoi. ((hieu qua) OR (hieu quan)) cam luc ((va hanh) OR (va dan)) va cua te.
• Adding a wildcard symbol may retrieve word variants: hoc sach van nang xa hoi. ((hieu qua) or (hieu quan)) cam luc ((va hanh) or (va dan)) va cua te*.