Perhaps you should try some spelling variations:
nguyen xuan » nguyen van
truong cao » truong dai
nhung cong » dung cong, thong cong, hang cong
van nguyen » toan nguyen, tran nguyen, xuan nguyen
hien xanh » hien nhanh, chieu xanh, hien khanh
hien hanh » dieu hanh
truong va » truong dai, truong dao, luong va
cong van » cong vang, cong san, song van

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)) - thanh ((truong va) or (truong cao)) nhung cong van nguyen xuan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien xanh) OR (hien hanh)) - thanh ((truong va) OR (truong cao)) nhung cong van nguyen xuan.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien xanh) OR (hien hanh)) - thanh ((truong va) or (truong cao)) nhung cong van nguyen xuan".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien xanh) OR (hien hanh)) - thanh ((truong va) or (truong cao)) nhung cong van nguyen xuan*.