Perhaps you should try some spelling variations:
canh manh » lanh manh, canh tranh, cach mang
ho chieu » theo chieu, hoc thieu, doi chieu
theo chu » theo chieu, cho chu, chao chu
manh qua » manh quan, manh cua, danh qua
qua dung » quang dung, su dung, qua song
cong tam » cong tan, cong nam, dong tam
cong tac » cong ty
toan cau » toan cao, toan ban, toan tap

You may be able to get more results by adjusting your search query.

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