Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
trinh hanh » trinh thanh, trinh anh, trinh hinh
nhung cong » dung cong, thong cong, hang cong
hoc thieu » toc thieu, hoc hien
trinh han » trinh quan
tan phan » toan phan, than phan, tai phan
van phan » van phong, van thanh, luan phan

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