Perhaps you should try some spelling variations:
van hanh » van thanh, van anh, van ban
ban hanh » ban hang
su triet » su viet, su tien, ve triet
su sach » so sach, vu sach
sach tu » sach thu, cach tu, sach ty
tu nang » tru nang, tu nong, tu nano
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
ve pham » vi pham, v pham, ve phan
pham vu » pham tu, pham va, pham vi
tri su » tri du, tai su, trinh su

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach tu nang xa hoi. hieu ve pham vu ((van hanh) or (ban hanh)) tri su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach tu nang xa hoi. hieu ve pham vu ((van hanh) OR (ban hanh)) tri su triet.
• Adding a wildcard symbol may retrieve word variants: su sach tu nang xa hoi. hieu ve pham vu ((van hanh) or (ban hanh)) tri su triet*.