Perhaps you should try some spelling variations:
hien tinh » khien tinh, thien tinh, dien tinh
bien tinh » bi tinh, yen tinh, diep tinh
cua trong » cua truong, cua trung, qua trong
anh tang » anh bang, anh dang, anh nang
tang cua » mang cua, hang cua, tang luan
cong dan » cong san, cong tan, huong dan
dan khan » dan khanh, dan chan, dan than
khan cap » khan ap, than cap, khoan cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hien tinh) or (bien tinh)) - anh tang cua trong cong dan khan cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien tinh) OR (bien tinh)) - anh tang cua trong cong dan khan cap.
• Adding a wildcard symbol may retrieve word variants: hoc ((hien tinh) or (bien tinh)) - anh tang cua trong cong dan khan cap*.