Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
ho chieu » theo chieu, hoc thieu, doi chieu
cong san » cong tac
san toan » van toan, dan toan, manh toan
toan cau » toan cao, toan ban, toan tap
doi chi » doi khi
vi hanh » vi thanh, va hanh, thi hanh
ve hanh » ve thanh, ve canh, va hanh

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)) sach - hanh trinh ((vi hanh) OR (ve hanh)) cong san toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (doi chi)) sach - hanh trinh ((vi hanh) OR (ve hanh)) cong san toan cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) or (doi chi)) sach - hanh trinh ((vi hanh) OR (ve hanh)) cong san toan cau*".