Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
chieu xanh » chieu sach, chieu sang, chieu tinh
nhung cong » dung cong, thong cong, hang cong
pham toan » pham tuan, pham tan, phap toan
tinh cua » trinh cua, tinh chat, tranh cua
sinh cua » manh cua, dinh cuu, sinh va
tac toan » tap toan, tam toan, hach 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 chieu xanh - hanh ((tinh cua) or (sinh cua)) nhung cong ((tac toan) or (pham toan)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chieu xanh - hanh ((tinh cua) OR (sinh cua)) nhung cong ((tac toan) OR (pham toan)) ban.
• Adding a wildcard symbol may retrieve word variants: theo chieu xanh - hanh ((tinh cua) or (sinh cua)) nhung cong ((tac toan) or (pham toan)) ban*.