Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
va hanh » van hanh, va thanh, va danh
dam tuc » dam thuc, dao tuc, nam thuc
sach ty » sach y, sach tu, xach tay
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
lang xa » lang ha, dang xay, lang van
dam tu » nam tu, cam tu, tam tu
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: toc ((sach ty) or (sach thu)) lang xa hoi. hieu va ((dam tuc) or (dam tu)) va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sach ty) OR (sach thu)) lang xa hoi. hieu va ((dam tuc) OR (dam tu)) va hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: toc ((sach ty) or (sach thu)) lang xa hoi. hieu va ((dam tuc) or (dam tu)) va hanh vi cua tre*.