Perhaps you should try some spelling variations:
hien nhanh » hien hanh, thien thanh, tien thanh
thanh tung » thanh cong
tung thanh » trung thanh, tang thanh, dung thanh
hien xanh » hien hanh, chieu xanh, hien khanh
dong cong » duong cong, dang cong, cong cong
dung cong » dung trong
manh toan » thanh toan, anh tuan, tinh toan
toan tap » toan ban

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