Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
hoc thieu » toc thieu, hoc hien
quang va » quang van, quan va, quang ma
cong dan » cong san, huong dan, cong dong
cong tan » cong tac, cong san, cong thanh
than cau » phan cau, than cap, thanh chau
toan cau » toan cao, toan ban, toan tap
va lang » va nang, hoa lang

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 - tran quang va lang ((cong dan) OR (cong tan)) ((than cau) or (toan cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu xanh - tran quang va lang ((cong dan) OR (cong tan)) ((than cau) OR (toan cau)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu xanh - tran quang va lang ((cong dan) OR (cong tan)) ((than cau) or (toan cau))".
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - tran quang va lang ((cong dan) OR (cong tan)) ((than cau) or (toan cau))*.