Perhaps you should try some spelling variations:
thieu tinh » trieu tinh, chieu tinh, lieu tinh
thien tinh » khien tinh, thien minh, tien tinh
hanh trinh » canh tranh, hanh chinh
trinh quan » tinh quang, trinh luat, trinh han
quan hang » quan hoang, quan lang, quan hanh
hang cong » dang cong, hang nong, bang cong
cong san » cong tac
toan cau » toan cao, toan ban, toan tap
doan dau » doan dieu, phan dau, doan va

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