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