Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
hanh trinh » canh tranh, hanh chinh
trinh van » trinh han, trinh quan, trinh toan
hang cong » dang cong, hang nong, bang cong
van hang » van khang, van hoang, van thang
cong tan » cong tac, cong san, cong thanh
than cau » phan cau, than cap, thanh chau
toan cau » toan cao, toan ban, toan tap

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