Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
hieu viec » nhieu viec, hieu ve, sieu viet
hanh vai » hanh vi, hanh va, hanh tai
viec cac » vien cac, viec cua, viec lam
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
tu sach » thu sach, su sach, te sach
va hanh » van hanh, va thanh, va danh
ky lang » ky nang, ky dang, ky tang
mai hoi » mai khoi, dai hoi, mai doi
vai cua » dai cua, hai cua, lai cua
lai hoi » dai hoi, lai hoa, lai roi
cua te » cua tu

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) or (thuoc sach)) ky lang ((mai hoi) or (lai hoi)). hieu viec cac nuoc va hanh vai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thuoc sach)) ky lang ((mai hoi) OR (lai hoi)). hieu viec cac nuoc va hanh vai cua te.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thuoc sach)) ky lang ((mai hoi) or (lai hoi)). hieu viec cac nuoc va hanh vai cua te*.