Perhaps you should try some spelling variations:
thanh trung » thanh tung
hoac khong » hoa khong, hoc khong, hay khong
doi chieu » doc hieu, doi chi, ho chieu
hoc thieu » toc thieu, hoc hien
hua khong » hoa khong, cua khong, phuc khong
cong dan » cong san, cong tan, huong dan
dan khan » dan khanh, dan chan, dan than
khan ap » khan cap, han ap, khan dam

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((doi chieu) or (hoc thieu)) sach - thanh trung ((hua khong) OR (hoac khong)) cong dan khan ap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (hoc thieu)) sach - thanh trung ((hua khong) OR (hoac khong)) cong dan khan ap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doi chieu) or (hoc thieu)) sach - thanh trung ((hua khong) OR (hoac khong)) cong dan khan ap".
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) or (hoc thieu)) sach - thanh trung ((hua khong) OR (hoac khong)) cong dan khan ap*.