Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
trinh toan » tinh toan, thanh toan, trinh quan
hoc thieu » toc thieu, hoc hien
trinh han » trinh quan
hang cong » dang cong, hang nong, bang cong
dung cong » dung trong
dan chan » dan gian, dan ca, van chat
chan cau » phan cau, can cau, chinh cau

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 - canh ((trinh toan) or (trinh han)) ((hang cong) or (dung cong)) dan chan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu xanh - canh ((trinh toan) OR (trinh han)) ((hang cong) OR (dung cong)) dan chan cau.
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - canh ((trinh toan) or (trinh han)) ((hang cong) or (dung cong)) dan chan cau*.