Perhaps you should try some spelling variations:
thanh trung » thanh tung
thieu xanh » chieu xanh, hieu manh, thien anh
hanh trinh » canh tranh, hanh chinh
hoc thieu » toc thieu, hoc hien
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
than cao » toan cao, thai cao, than cap

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

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