Perhaps you should try some spelling variations:
thanh trong » thanh trung, tranh trong, hanh trong
theo chieu » theo tieu, ho chieu, theo chu
chieu sach » chinh sach, chiet tach, chieu sang
trong kha » trong khoa, trong nha, trong ha
dung cong » dung trong
kha dung » khoa dung, khao dung, nha dung
cong bai » cuong bai, cong hai, cung bai
tap cau » tap cac, tao cau, tap can
ta cau » tao cau, tra cau, va cau

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 trong kha dung cong bai ((tap cau) or (ta cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chieu sach - thanh trong kha dung cong bai ((tap cau) OR (ta cau)).
• Adding a wildcard symbol may retrieve word variants: theo chieu sach - thanh trong kha dung cong bai ((tap cau) or (ta cau))*.