Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
trinh cong » trinh dung
vach tran » sach tranh, hach toan, sach tren
tran cong » tran hong, trien cong, tran hoang
cong khi » cong thai, khong khi, co khi
tu canh » thu canh, tu chanh, tu can
tu vach » tu cach, tu hach, tu sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tu canh trinh cong khi đong luc ) or ( tu vach tran cong khi đong luc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu canh trinh cong khi đong luc ) OR ( tu vach tran cong khi đong luc )).
• Adding a wildcard symbol may retrieve word variants: (( tu canh trinh cong khi đong luc ) or ( tu vach tran cong khi đong luc ))*.