Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
va triet » va thiet, va trien, ve triet
van hanh » ban hanh, van anh, van ban
sach ky » sac ky, sach y, sach ty
cau luc » cau truc, cau phuc
te sach » toc sach
dang va » dang van, dang vat, hang va
hieu ve » hieu van
ky dang » ky nang, ky danh
hieu va » lieu va, hieu qua
va hoi » xa hoi, va hoc, va hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky dang va hoi. ((hieu ve) or (hieu va)) cau luc ((van hanh) OR (van thanh)) tu va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky dang va hoi. ((hieu ve) OR (hieu va)) cau luc ((van hanh) OR (van thanh)) tu va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky dang va hoi. ((hieu ve) or (hieu va)) cau luc ((van hanh) OR (van thanh)) tu va triet".
• Adding a wildcard symbol may retrieve word variants: te sach ky dang va hoi. ((hieu ve) or (hieu va)) cau luc ((van hanh) OR (van thanh)) tu va triet*.