Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
trinh luan » trinh luat, trinh quan, trinh han
luan hang » luan nang, luan han, luan hung
hang cong » dang cong, hang nong, bang cong
hoa phan » hoa dan, co phan
cong tac » cong ty
tac tren » rac tren, tai tren, tap tren
tren cau » tren ca, tren cay, tren tau
a chau » ha chau, lai chau, hat chau

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoa phan) or (a chau)) tinh - canh trinh luan hang cong tac tren cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoa phan) OR (a chau)) tinh - canh trinh luan hang cong tac tren cau.
• Adding a wildcard symbol may retrieve word variants: ((hoa phan) or (a chau)) tinh - canh trinh luan hang cong tac tren cau*.