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 tac » cac toc, cac bac, cac dac
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
nang xa » nang x, lang xa, nang ma
te sach » toc sach
y nang » ky nang, ly nang, v nang
va dan » ca dan, va dao, va dau
cac tu » cac thu, cach tu, cac du

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 tu) or (cac tac)) 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 tu) OR (cac tac)) 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 tu) or (cac tac)) va dan thi cua tre*.