Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, tu cach
thi cua » thai cua, thi cuc, tri cua
dan thi » dang thi, tran thi, dinh thi
cac dac » cac dan, cac dai, cac bac
hieu va » lieu va, hieu qua
cac tuc » cac toc, cac tu, cac tac
nang xa » nang x, lang xa, nang ma
te sach » toc sach
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v 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: ((tu sach) or (te sach)) y nang xa hoi. hieu va ((cac tuc) or (cac dac)) va dan thi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) y nang xa hoi. hieu va ((cac tuc) OR (cac dac)) va dan thi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) y nang xa hoi. hieu va ((cac tuc) or (cac dac)) va dan thi cua tre*.