Perhaps you should try some spelling variations:
hanh tai » thanh tai, hang tai, han tai
sach dao » lanh dao
hieu va » lieu va, hieu qua
tai cua » thai cua, tai cuc, tri cua
va hanh » van hanh, va thanh, va danh
cam tuc » cam xuc, cam tu, nam thuc
cua tre » cua te, cuu tre, cua triet
sach ly » sach y, sach lo, sach ty
hieu ve » hieu van
hang xa » hoang xa, hang va, hang ca
tuc va » thuc va, truc va, tuc xa

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

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