Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
khau sach » hau sach, khoa sach, pham sach
trinh van » trinh han, trinh quan, trinh toan
nang cong » nang song, dang cong, bang cong
tran chau » tranh chap, tran huu
rau sach » cau sach, hau sach, nam sach
van nang » van quang, van ban, van dong
cong tan » cong tac, cong san, cong thanh

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((rau sach) or (khau sach)) - hanh trinh van nang cong tan tran chau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((rau sach) OR (khau sach)) - hanh trinh van nang cong tan tran chau.
• Adding a wildcard symbol may retrieve word variants: theo ((rau sach) or (khau sach)) - hanh trinh van nang cong tan tran chau*.