Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
tieu xanh » tieu danh, chieu xanh, dieu hanh
hang hang » nang hang, cang thang, hung thang
va thong » va thuong, va phuong, he thong
tan toan » tan tran, tap toan, van toan
tap quan » tac quan, hai quan
bai toan » bai tap

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 - hang hang va thong cong ((tan toan) or (((tap quan) or (bai toan)))) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu xanh - hang hang va thong cong ((tan toan) OR (((tap quan) OR (bai toan)))) cau.
• Adding a wildcard symbol may retrieve word variants: theo tieu xanh - hang hang va thong cong ((tan toan) or (((tap quan) or (bai toan)))) cau*.