Perhaps you should try some spelling variations:
thanh trung » thanh tung
dan trinh » dan tinh, van trinh, hanh trinh
trung vap » trung cap, trung va, trung van
hang cong » dang cong, hang nong, bang cong
khoa dan » khoa dang, hoa dan, khoa can
vap hang » van hang, va hang, van khang
cong san » cong tac
san than » sang than, san thanh, ban than
than cap » khan cap, thanh lap, thanh cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: khoa dan trinh - thanh trung vap hang cong san than cap~.
• Adding a wildcard symbol may retrieve word variants: khoa dan trinh - thanh trung vap hang cong san than cap*.