Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
tinh trang » minh trang, tinh quang, tinh toan
hoc thieu » toc thieu, hoc hien
tinh lang » dinh lang, tinh sang, tinh bang
bang cong » dang cong, bang song, hang cong
cong tan » cong tac, cong san, cong thanh
than cau » toan cau, phan cau, than cap
toan cao » toan ban, toan tap
va bang » va nang, va lang, va ban

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 - ((tinh trang) or (tinh lang)) va bang cong tan ((than cau) or (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu xanh - ((tinh trang) OR (tinh lang)) va bang cong tan ((than cau) OR (toan cao)).
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - ((tinh trang) or (tinh lang)) va bang cong tan ((than cau) or (toan cao))*.