Perhaps you should try some spelling variations:
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
hieu va » hieu qua
cac tuc » cac toc, cac tu, cac nuoc
cac tac » cac toc, cac bac, cac dac
dan tri » dan thi, van tri, dan tai
cua tre » cua te, cuu tre, cua triet
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang
va dan » ca dan, va dao, va dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach v nang xa hoi. ((hieu va) or (lieu va)) ((cac tuc) or (cac tac)) va dan tri cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach v nang xa hoi. ((hieu va) OR (lieu va)) ((cac tuc) OR (cac tac)) va dan tri cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach v nang xa hoi. ((hieu va) or (lieu va)) ((cac tuc) or (cac tac)) va dan tri cua tre*.