Perhaps you should try some spelling variations:
thanh dong » thanh duong, thanh cong, nhanh dong
thong cong » trong cong, tong cong, thong thong
hien xanh » hien hanh, hien nhanh, chieu xanh
hanh dong » anh dong, ha dong
cua thong » cua thuong, cua khong, cua tong
tac toan » tap toan, hach toan, tich toan
tam toan » tap toan, tam than, pham toan

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