Perhaps you should try some spelling variations:
tien thanh » tien thinh, tran thanh
den thanh » de thanh, dinh thanh, dong thanh
trinh hoa » trinh do, trinh han
dung cong » dung trong
cong manh » cong danh, duong manh, cong thanh
manh toan » thanh toan, anh tuan, tinh toan
trinh he » trinh han, trinh thi, trinh ky
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: doan ((tien thanh) OR (den thanh)) - hanh ((trinh he) OR (trinh hoa)) dung cong manh toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doan ((tien thanh) OR (den thanh)) - hanh ((trinh he) or (trinh hoa)) dung cong manh toan cao~".
• Adding a wildcard symbol may retrieve word variants: doan ((tien thanh) OR (den thanh)) - hanh ((trinh he) or (trinh hoa)) dung cong manh toan cao*.