Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
bien tinh » bi tinh, yen tinh, diep tinh
quan tuan » quang tuan, quan quan, xuan tuan
cong van » cong vang, cong san, song van
van hanh » van thanh, ban hanh, van anh
hanh cap » hanh cac, hanh cat, hanh cad
so bien » mot bien

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

• Performing a fuzzy search may retrieve terms with similar spellings: so bien tinh - thanh ((quan tuan) or (quan luan)) thong cong van hanh cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so bien tinh - thanh ((quan tuan) OR (quan luan)) thong cong van hanh cap*.