Perhaps you should try some spelling variations:
hieu quan » lieu quan, thien quan, lien quan
hoc sach » hoc sinh, hoc cac
hanh va » hang va, hanh vi
va hanh » van hanh, va thanh, va danh
cam luc » cam xuc, cau luc
cua tre » cua te, cuu tre, cua triet
hoc anh » hoc nganh, hoc nhanh, ngoc anh
nang xa » nang x, lang xa, nang ma
v nang » va nang, vu nang, van nang
luc va » duc va, tuc va, loc va
va cua » va chua, via cua, ca cua

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) OR (hoc anh)) v nang xa hoi. ((hieu qua) or (hieu quan)) cam luc va hanh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc sach) OR (hoc anh)) v nang xa hoi. ((hieu qua) OR (hieu quan)) cam luc va hanh va cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc sach) OR (hoc anh)) v nang xa hoi. ((hieu qua) or (hieu quan)) cam luc va hanh va cua tre".
• Adding a wildcard symbol may retrieve word variants: ((hoc sach) OR (hoc anh)) v nang xa hoi. ((hieu qua) or (hieu quan)) cam luc va hanh va cua tre*.