Perhaps you should try some spelling variations:
ban thanh » ban hanh
va triet » va thiet, va trien, ve triet
ban hang » ngan hang
dau quoc » dan quoc, dau nuoc, dang quoc
tu sach » thu sach, su sach, te sach
da quoc » dan quoc, da duoc, de quoc
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
hai va » hai van, thai va, hoi 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 ky nang xa hoi. hieu va ((dau quoc) OR (da quoc)) ((ban thanh) or (ban hang)) hai va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. hieu va ((dau quoc) OR (da quoc)) ((ban thanh) OR (ban hang)) hai va triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang xa hoi. hieu va ((dau quoc) OR (da quoc)) ((ban thanh) or (ban hang)) hai va triet*".