Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
doc sach » toc sach, nuoc sach, dac sac
va nang » van nang, da nang, cam nang
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
cam luc » cam xuc, cau luc
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
va cam » va cham, va cac, va cao
luc va » duc va, tuc va, loc va
vi cua » vai cua, di 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 (doc sach)) va nang xa hoi. hieu va cam luc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc sach) OR (doc sach)) va nang xa hoi. hieu va cam luc va hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((hoc sach) or (doc sach)) va nang xa hoi. hieu va cam luc va hanh vi cua tre*.