Perhaps you should try some spelling variations:
nhanh hanh » nhanh thanh, nhanh thang, thanh thanh
thong cong » trong cong, tong cong, thong thong
tieu xanh » tieu danh, chieu xanh, dieu hanh
cua thong » cua thuong, cua khong, cua tong
hanh cua » manh cua, hang cua, hanh sua
tap toan » tap quan, bai toan
tap doan » tap quan

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: theo tieu xanh - nhanh hanh cua thong cong ((tap toan) or (tap doan)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu xanh - nhanh hanh cua thong cong ((tap toan) OR (tap doan)) ban*.