Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van hanh » van thanh, ban hanh, van anh
hanh lai » hanh lam, hanh tai, thanh lap
su triet » su viet, su tien, ve triet
tu sach » thu sach, te sach, tu cach
su sach » so sach, vu sach
nang co » nang cao, nang doc, nang noi
van bac » van ban, van bao, van hac
bac vo » bac bo, bac ho, bac va

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 x) or (nang co)) hoi. hieu van bac vo van hanh lai su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky ((nang x) OR (nang co)) hoi. hieu van bac vo van hanh lai su triet.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) ky ((nang x) or (nang co)) hoi. hieu van bac vo van hanh lai su triet*.