Perhaps you should try some spelling variations:
chu trieu » chua trieu, cau trieu, cac trieu
hieu suat » hieu luat, hieu qua
thu sach » thuat sach, thuoc sach, thu hoach
chau doc » chat doc, cau do, phau hoc
danh va » doanh va, hanh va, anh va
va danh » va dinh, va dan, va hanh
tu sach » su sach, te sach, tu cach
hieu vu » hieu va, hieu ve, hieu su
danh ma » anh ma, danh ca, hanh ma
ky danh » ky anh, ky dang
ma hoi » mai hoi, xa hoi, ma hoa
doc va » duoc va, hoc va, duc va
va chu » va che, va cau, va chi

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 (thu sach)) ky danh ma hoi. ((hieu vu) or (hieu suat)) chau doc va danh va chu trieu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky danh ma hoi. ((hieu vu) OR (hieu suat)) chau doc va danh va chu trieu.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ky danh ma hoi. ((hieu vu) or (hieu suat)) chau doc va danh va chu trieu*.