Perhaps you should try some spelling variations:
thien van » thi van
nam duoc » nam thuoc, da duoc, dat duoc
hanh lai » hanh lam, hanh tai, thanh lap
van hanh » van thanh, ban hanh, van anh
cao duc » dao duc, cao suc, giao duc
lai cua » dai cua, hai cua, lai chau
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
hieu va » lieu va, hieu qua
hang xa » hoang xa, hang va, hang ca
ty hang » ly hang, ty xang, thi hang
cua tre » cua te, cuu tre, cua triet

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 ty hang xa hoi. ((thien van) or (hieu va)) ((nam duoc) or (cao duc)) van hanh lai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty hang xa hoi. ((thien van) OR (hieu va)) ((nam duoc) OR (cao duc)) van hanh lai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ty hang xa hoi. ((thien van) or (hieu va)) ((nam duoc) or (cao duc)) van hanh lai cua tre*.