Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
ban hanh » ban hang
van hanh » van thanh, van anh, van ban
chat luc » chat xuc, chat lua, nhan luc
hieu cao » chieu cao, hieu cac, hieu ca
hang cau » hang dau, hang ca, nhung cau
ty hang » ly hang, ty xang, thi hang
vu sach » vu bach, vu khach
su sach » so sach
lam va » nam va, dam va, lam ha

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) OR (vu sach)) ty hang cau hoi. hieu cao chat luc ((van hanh) or (ban hanh)) lam va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) ty hang cau hoi. hieu cao chat luc ((van hanh) OR (ban hanh)) lam va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (vu sach)) ty hang cau hoi. hieu cao chat luc ((van hanh) or (ban hanh)) lam va triet".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (vu sach)) ty hang cau hoi. hieu cao chat luc ((van hanh) or (ban hanh)) lam va triet*.