Perhaps you should try some spelling variations:
hien xanh » hien nhanh, chieu xanh, hien khanh
hien hanh » dieu hanh
hang cong » dang cong, hang nong, bang cong
trang va » hang va
tran van » luan van
cong tai » cong thai, cong tac, dong tai
ngan dau » nganh dau, ngay dau, ngan danh

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hien xanh) OR (hien hanh)) - canh ((trang va) or (tran van)) hang cong tai ngan dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien xanh) OR (hien hanh)) - canh ((trang va) OR (tran van)) hang cong tai ngan dau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien xanh) OR (hien hanh)) - canh ((trang va) or (tran van)) hang cong tai ngan dau".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien xanh) OR (hien hanh)) - canh ((trang va) or (tran van)) hang cong tai ngan dau*.