Perhaps you should try some spelling variations:
thanh trung » thanh tung
toan nguyen » hoang nguyen
hien nhanh » hien hanh, thien thanh, tien thanh
van nguyen » tran nguyen, xuan nguyen, tuan nguyen
hien xanh » hien hanh, chieu xanh, hien khanh
nang cong » nang song, dang cong, bang cong
trung va » truong va, trang va, trung ha
va nang » van nang, da nang, cam nang

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