Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, hieu manh
hieu xanh » chieu xanh, hieu manh, dieu hanh
trinh vat » trinh van, trinh luat, sinh vat
hang long » thang long, hoang long, hang luong
long tinh » cong tinh, trong tinh, luong tin
toan ban » van ban
tinh va » tich va, trinh van, tinh gia

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 nganh)) - thanh ((tinh va) or (trinh vat)) hang long tinh toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu xanh) OR (hieu nganh)) - thanh ((tinh va) OR (trinh vat)) hang long tinh toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu xanh) OR (hieu nganh)) - thanh ((tinh va) or (trinh vat)) hang long tinh toan ban".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu xanh) OR (hieu nganh)) - thanh ((tinh va) or (trinh vat)) hang long tinh toan ban*.