Perhaps you should try some spelling variations:
theo chieu » theo tieu, theo chu, thi chieu
hanh trinh » canh tranh, hanh chinh
trinh chua » trinh chuan, trinh cua, trinh chu
chua dang » cua dang, chua dong, chua nang
dang cong » dung cong
ho chieu » hoc thieu, doi chieu, mot chieu
tap quan » tac quan, hai quan

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 (theo chieu)) tinh - hanh trinh chua dang cong ((tap doan) OR (tap quan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (theo chieu)) tinh - hanh trinh chua dang cong ((tap doan) OR (tap quan)) cao*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) or (theo chieu)) tinh - hanh trinh chua dang cong ((tap doan) OR (tap quan)) cao*".