Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
doi chieu » doc hieu, doi chi, mot chieu
luong nin » luong ninh, luong tin, luong nan
ho chieu » theo chieu, hoc thieu, mot chieu
nin toan » tinh toan
toan cau » toan cao, toan ban, toan tap
ve dung » ve duong, va dung, te dung
ve rung » le trung, he trung, va trung

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