Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
trang cua » tranh cua, trung cua, thang cua
theo chu » theo chieu, cho chu, chao chu
chu xanh » chu manh, chieu xanh, chua xang
tang cua » mang cua, hang cua, tang luan
tac toan » tam toan, hach toan, tich toan
tap toan » tap doan, tap quan, bai toan

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo chu xanh - hanh ((trang cua) or (tang cua)) thong cong ((tac toan) OR (tap toan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chu xanh - hanh ((trang cua) OR (tang cua)) thong cong ((tac toan) OR (tap toan)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chu xanh - hanh ((trang cua) or (tang cua)) thong cong ((tac toan) OR (tap toan)) cau".
• Adding a wildcard symbol may retrieve word variants: theo chu xanh - hanh ((trang cua) or (tang cua)) thong cong ((tac toan) OR (tap toan)) cau*.