Perhaps you should try some spelling variations:
thai tren » thai tran, thi tren, thai trang
nuoc ban » nuoc san, quoc ban, buoc ban
chau tre » chay tren, chau tho, cho tre
hanh lam » thanh lap, hanh kem, hanh va
ban hanh » ban hang
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
hieu ve » hieu va, hieu van
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
su sach » so sach, vu sach
ve cac » va cac, vien cac
x hoi » o hoi, x ho, 5 hoi

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 ty nang ((x hoi) OR (xa hoi)). hieu ve cac nuoc ban hanh lam ((chau tre) or (thai tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang ((x hoi) OR (xa hoi)). hieu ve cac nuoc ban hanh lam ((chau tre) OR (thai tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty nang ((x hoi) OR (xa hoi)). hieu ve cac nuoc ban hanh lam ((chau tre) or (thai tren))".
• Adding a wildcard symbol may retrieve word variants: su sach ty nang ((x hoi) OR (xa hoi)). hieu ve cac nuoc ban hanh lam ((chau tre) or (thai tren))*.