Perhaps you should try some spelling variations:
trinh thuat » trinh luat, trinh thiet, trinh thuc
nhung luong » nhung huong, nhung tuong, thuong luong
theo chieu » theo tieu, theo chu, thi chieu
hanh trinh » canh tranh, hanh chinh
hung luong » hung vuong, dung luong, hang luong
manh toan » thanh toan, anh tuan, tinh toan
ho chieu » hoc thieu, doi chieu, mot chieu
toan cau » toan cao, toan ban, toan tap

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)) sach - hanh trinh thuat ((nhung luong) OR (hung luong)) manh toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (theo chieu)) sach - hanh trinh thuat ((nhung luong) OR (hung luong)) manh toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) or (theo chieu)) sach - hanh trinh thuat ((nhung luong) OR (hung luong)) manh toan cau".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (theo chieu)) sach - hanh trinh thuat ((nhung luong) OR (hung luong)) manh toan cau*.