Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
hien manh » hien hanh, tien manh, hieu manh
trinh van » trinh han, trinh quan, trinh toan
hang cong » hang nong, bang cong, thanh cong
dang cong » dung cong
dan phan » doan phan, dan chan, van phan
phan cau » phan dau, phan cac, phan tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hien manh - canh trinh van ((hang cong) or (dang cong)) dan phan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien manh - canh trinh van ((hang cong) OR (dang cong)) dan phan cau.
• Adding a wildcard symbol may retrieve word variants: hoc hien manh - canh trinh van ((hang cong) or (dang cong)) dan phan cau*.