Perhaps you should try some spelling variations:
thanh tung » thanh cong
hieu xanh » chieu xanh, hieu nganh, dieu hanh
hieu manh » chieu xanh, hieu nganh, dieu hanh
hang cong » dang cong, hang nong, bang cong
cong nang » cong ngang, cong lang, cong nong
trung va » truong va, trang va, trung ha
thanh tu » hanh tu, nhanh tu, thanh thuy
va hang » van hang, va nang, va lang

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((hieu xanh) or (hieu manh)) - thanh trung va hang cong nang ((thanh tu) OR (thanh tung))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu xanh) OR (hieu manh)) - thanh trung va hang cong nang ((thanh tu) OR (thanh tung)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu xanh) or (hieu manh)) - thanh trung va hang cong nang ((thanh tu) OR (thanh tung))".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu xanh) or (hieu manh)) - thanh trung va hang cong nang ((thanh tu) OR (thanh tung))*.