Perhaps you should try some spelling variations:
thai tren » thai tran, thi tren, thai trang
cham quoc » chuan quoc, han quoc, cham soc
cau tren » cu tren, dau tren, ca tren
ban hanh » ban hang
quoc ban » quoc bao, quoc lan, quoc quan
hieu su » hieu sau, tieu su, hieu so
tu sach » thu sach, su sach, te sach
k1 danh » ky danh, kho danh
su cham » su pham, tu cham, vu cham
1 danh » 2 danh

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 ((1 danh) or (k1 danh)) xa hoi. hieu su cham quoc ban hanh vi ((cau tren) or (thai tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((1 danh) OR (k1 danh)) xa hoi. hieu su cham quoc ban hanh vi ((cau tren) OR (thai tren)).
• Adding a wildcard symbol may retrieve word variants: tu sach ((1 danh) or (k1 danh)) xa hoi. hieu su cham quoc ban hanh vi ((cau tren) or (thai tren))*.