Perhaps you should try some spelling variations:
thien van » thi van
cham doc » cham soc, chat doc, pham duc
chau doc » chat doc, cau do, phau hoc
van hanh » van thanh, ban hanh, van anh
hanh lai » hanh lam, hanh tai, thanh lap
tu sach » thu sach, te sach, tu cach
su sach » so sach, vu sach
cao hoi » cau hoi, co hoi, cao hoc
kien » bien, vien, tien

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 (su sach)) ky nang cao hoi. thien van ((cham doc) or (chau doc)) van hanh lai su kien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky nang cao hoi. thien van ((cham doc) OR (chau doc)) van hanh lai su kien.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) ky nang cao hoi. thien van ((cham doc) or (chau doc)) van hanh lai su kien*.