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