Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
thanh tung » thanh cong
hoc thieu » toc thieu, hoc hien
van phong » hai phong
tung can » trung can, tung dan, trung cap
dan than » dan chan, ban than, van than
than cau » toan cau, phan cau, 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 - thanh tung can ((van phong) or (van dong)) dan than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu xanh - thanh tung can ((van phong) OR (van dong)) dan than cau.
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - thanh tung can ((van phong) or (van dong)) dan than cau*.