Perhaps you should try some spelling variations:
thanh trung » thanh tung
thieu xanh » chieu xanh, hieu manh, thien anh
hoc thieu » toc thieu, hoc hien
trung can » trung cap, trung van, trong can
cong dan » cong san, huong dan, cong dong
cong tan » cong tac, cong san, cong thanh
than cau » toan cau, phan cau, than cap
can van » cac van, can ban, tan van

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 - thanh trung can van ((cong dan) OR (cong tan)) than cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu xanh - thanh trung can van ((cong dan) OR (cong tan)) than cau".
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - thanh trung can van ((cong dan) OR (cong tan)) than cau*.