Perhaps you should try some spelling variations:
thanh doi » thanh loi, thanh moi, thanh hoai
sach thu » sach thue, sach thieu, sach tham
thanh do » thanh de, thanh pho, thanh hoa
cam tuc » cam xuc, cam tu, nam thuc
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
sach tu » cach tu, sach ty, sach uu
tuc va » thuc va, truc va, tuc xa
va cam » va cham, va cac, va cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sach thu) or (sach tu)) nang xa hoi. hieu va cam tuc va ((thanh doi) OR (thanh do)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach thu) OR (sach tu)) nang xa hoi. hieu va cam tuc va ((thanh doi) OR (thanh do)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach thu) or (sach tu)) nang xa hoi. hieu va cam tuc va ((thanh doi) OR (thanh do)) cua tre".
• Adding a wildcard symbol may retrieve word variants: te ((sach thu) or (sach tu)) nang xa hoi. hieu va cam tuc va ((thanh doi) OR (thanh do)) cua tre*.