Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
vu khach » vu khanh, vu khac, vay khach
thu sach » tu sach, thuat sach, thuoc sach
thanh va » thanh van, hanh va, thanh ha
su triet » su viet, ve triet
nang xa » nang x, lang xa, nang ma
thu ban » thu hang
su tien » su kien, su hien, tu tieng
va nam » van nam, ha nam, va nay

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((vu khach) or (thu sach)) ky nang xa hoi. lieu va nam thu ban thanh va ((su triet) OR (su tien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu khach) OR (thu sach)) ky nang xa hoi. lieu va nam thu ban thanh va ((su triet) OR (su tien)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu khach) or (thu sach)) ky nang xa hoi. lieu va nam thu ban thanh va ((su triet) OR (su tien))".
• Adding a wildcard symbol may retrieve word variants: ((vu khach) or (thu sach)) ky nang xa hoi. lieu va nam thu ban thanh va ((su triet) OR (su tien))*.