Perhaps you should try some spelling variations:
thien tinh » khien tinh, thien minh, tien tinh
hoc thien » hoc hien, hoc thieu, hoc thiet
trung va » truong va, trung ha, trung tam
trang va » tran van, hang va
cong dan » cong san, huong dan, cong dong
cong tan » cong tac, cong san, cong thanh
toan cao » toan ban, toan tap

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