Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
hanh trinh » canh tranh, hanh chinh
hoc thieu » toc thieu, hoc hien
hanh tran » hanh trang, thanh tran, hanh tram
trinh han » trinh quan
han cong » phan cong, hang cong, hanh cong
van toan » van tuan, van thanh, manh toan
van tan » van tuan, van ban, van tai

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