Perhaps you should try some spelling variations:
bien tinh » bi tinh, yen tinh, diep tinh
dung cong » dung trong
cong lang » cong vang, cong luong, cong quang
trung va » truong va, trung ha, trung tam
trang va » hang va
tran van » luan van
lang ban » hang ban, lang van, nang ban
ho bien » pho bien, hoa bien, so bien
ban cau » bang cau, ban can, van cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho bien tinh - hanh ((((trung va) or (trang va))) or (tran van)) dung cong lang ban cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho bien tinh - hanh ((((trung va) OR (trang va))) OR (tran van)) dung cong lang ban cau.
• Adding a wildcard symbol may retrieve word variants: ho bien tinh - hanh ((((trung va) or (trang va))) or (tran van)) dung cong lang ban cau*.