Perhaps you should try some spelling variations:
thanh trung » thanh tung
khien tinh » thien tinh, khien thich, bien tinh
manh trung » manh tung, manh hung, sinh trung
hoc khien » hoc hien, hoc nghien, hoc thieu
cong dan » cong san, huong dan, cong dong
cong tan » cong tac, cong san, cong thanh
chan tap » han tap, phan tap, chan ta

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

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