Perhaps you should try some spelling variations:
thai tren » thai tran, thi tren, thai trang
chau tre » chay tren, chau tho, cho tre
hanh lam » thanh lap, hanh kem, hanh va
ban hanh » ban hang
thu sach » tu sach, thuat sach, thuoc sach
hieu ve » hieu va, hieu van
cao duc » dao duc, cao suc, giao duc
duc ban » duc tan, duc van, dua ban
ty nang » ky nang, ty hang, ly nang
ve cao » va cao, ve bao, ve cac
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ((ty nang) or (ty xang)) x hoi. hieu ve cao duc ban hanh lam ((chau tre) or (thai tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((ty nang) OR (ty xang)) x hoi. hieu ve cao duc ban hanh lam ((chau tre) OR (thai tren)).
• Adding a wildcard symbol may retrieve word variants: thu sach ((ty nang) or (ty xang)) x hoi. hieu ve cao duc ban hanh lam ((chau tre) or (thai tren))*.