Perhaps you should try some spelling variations:
hanh trung » thanh trung, hanh trang, manh trung
hanh trinh » canh tranh, hanh chinh
cong ngang » cong nhan, cong quang, cong lang
tong cong » trong cong, cong cong, dung cong
toan cau » toan cao, toan tap, toan tai
toan ban » van ban
theo ho » theo hop, theo bo, tho ho
va tong » va thong, va tuong, va trong

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: theo ho manh - ((hanh trung) OR (hanh trinh)) va tong cong ngang ((toan cau) OR (toan ban))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ho manh - ((hanh trung) or (hanh trinh)) va tong cong ngang ((toan cau) OR (toan ban))~".
• Adding a wildcard symbol may retrieve word variants: theo ho manh - ((hanh trung) or (hanh trinh)) va tong cong ngang ((toan cau) OR (toan ban))*.