Perhaps you should try some spelling variations:
hoc thieu » toc thieu, hoc hien
hanh hang » thanh hang, hang hang, hanh han
ho chieu » theo chieu, doi chieu, mot chieu
va thong » va thuong, va phuong, he thong
cong tan » cong san, cong thanh, cong ty
cong tac » cong ty
tran cau » tran chau, toan cau, ran cau

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((ho chieu) or (hoc thieu)) tinh - hanh hang va thong ((cong tan) OR (cong tac)) tran cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (hoc thieu)) tinh - hanh hang va thong ((cong tan) OR (cong tac)) tran cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) or (hoc thieu)) tinh - hanh hang va thong ((cong tan) OR (cong tac)) tran cau".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (hoc thieu)) tinh - hanh hang va thong ((cong tan) OR (cong tac)) tran cau*.