Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
quan nhung » qua nhung, cua nhung, quang hung
luan chung » luan chinh
ho chieu » theo chieu, hoc thieu, doi chieu
cong tan » cong tac, cong san, cong thanh
tan toan » tan tran, tap toan, van toan
toan cao » toan ban, toan tap
doi chi » doi khi

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 (doi chi)) tinh - hanh trinh ((quan nhung) OR (luan chung)) cong tan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (doi chi)) tinh - hanh trinh ((quan nhung) OR (luan chung)) cong tan toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) or (doi chi)) tinh - hanh trinh ((quan nhung) OR (luan chung)) cong tan toan cao".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (doi chi)) tinh - hanh trinh ((quan nhung) OR (luan chung)) cong tan toan cao*.