Perhaps you should try some spelling variations:
chieu tinh » trieu tinh, lieu tinh, chau tinh
hanh trinh » canh tranh, hanh chinh
hoc chieu » hoc thieu, ho chieu, hoc hien
trinh vap » trinh van, trinh vat, trinh va
vap thong » va thong, van thong, phap thong
cong tan » cong tac, cong thanh, cong ty
cong san » cong tac
toan cau » toan ban, toan tap, toan tai
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 chieu tinh - hanh trinh vap thong ((cong tan) OR (cong san)) ((toan cau) or (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chieu tinh - hanh trinh vap thong ((cong tan) OR (cong san)) ((toan cau) OR (toan cao)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc chieu tinh - hanh trinh vap thong ((cong tan) OR (cong san)) ((toan cau) or (toan cao))".
• Adding a wildcard symbol may retrieve word variants: hoc chieu tinh - hanh trinh vap thong ((cong tan) OR (cong san)) ((toan cau) or (toan cao))*.