Perhaps you should try some spelling variations:
va thieu » va thiet, va hieu, va tieu
cac thuc » cach thuc, can thuc, cay thuc
hanh vai » hanh vi, hanh va, hanh tai
van hanh » van thanh, ban hanh, van anh
hieu van » hieu va, thien van, lieu va
cac thu » cach thuc, cac thoi
te sach » toc sach
ky danh » ky anh
ky dang » ky nang
vai va » mai va, dai va, hai va

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) or (ky danh)) xa hoi. hieu van ((cac thuc) OR (cac thu)) van hanh vai va thieu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ky dang) OR (ky danh)) xa hoi. hieu van ((cac thuc) OR (cac thu)) van hanh vai va thieu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((ky dang) or (ky danh)) xa hoi. hieu van ((cac thuc) OR (cac thu)) van hanh vai va thieu".
• Adding a wildcard symbol may retrieve word variants: te sach ((ky dang) or (ky danh)) xa hoi. hieu van ((cac thuc) OR (cac thu)) van hanh vai va thieu*.