Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
hieu van » thien van, lieu va, hieu ve
va thanh » gia thanh, va tinh, le thanh
su triet » su viet, su tien, ve triet
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
cao suc » cao su, cao duc
x hoi » xa hoi, o hoi, x ho

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 ky nang x hoi. ((hieu van) or (hieu va)) cao suc ((va thanh) OR (ban thanh)) va su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang x hoi. ((hieu van) OR (hieu va)) cao suc ((va thanh) OR (ban thanh)) va su triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang x hoi. ((hieu van) or (hieu va)) cao suc ((va thanh) OR (ban thanh)) va su triet*".