Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
chieu sach » chinh sach, chiet tach, chieu sang
nhung cong » dung cong, thong cong, hang cong
sang cua » mang cua, song cua, hang cua
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan cao » toan ban, toan tap
dan cua » dan ca, ban cua, dai cua

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 sach - thanh ((sang cua) or (dan cua)) nhung cong tac toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chieu sach - thanh ((sang cua) OR (dan cua)) nhung cong tac toan cao.
• Adding a wildcard symbol may retrieve word variants: theo chieu sach - thanh ((sang cua) or (dan cua)) nhung cong tac toan cao*.