Perhaps you should try some spelling variations:
thanh trung » thanh tung
thanh trang » hanh trang, thanh thang, thanh tran
thien nang » thien bang, thien dang, trien nang
hoc thien » hoc hien, hoc thieu, hoc thiet
cong dan » cong san, huong dan, cong dong
cong tan » cong tac, cong san, cong thanh
toan tap » toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thien nang - ((thanh trang) or (thanh trung)) va nhung ((cong dan) OR (cong tan)) toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thien nang - ((thanh trang) OR (thanh trung)) va nhung ((cong dan) OR (cong tan)) toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thien nang - ((thanh trang) or (thanh trung)) va nhung ((cong dan) OR (cong tan)) toan tap".
• Adding a wildcard symbol may retrieve word variants: hoc thien nang - ((thanh trang) or (thanh trung)) va nhung ((cong dan) OR (cong tan)) toan tap*.