Perhaps you should try some spelling variations:
nhung phuong » dung phuong, nhu phuong, truong phuong
nhung chong » nhung cong, nhung phong, phong chong
theo chieu » theo tieu, ho chieu, theo chu
chieu sach » chinh sach, chiet tach, chieu sang
trung cap » truong cao, trung tam
trung va » truong va, trang va, trung ha
bai toan » bai tap
toan cao » toan ban, toan 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 chieu sach - thanh ((trung va) or (trung cap)) ((nhung chong) OR (nhung phuong)) bai toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chieu sach - thanh ((trung va) OR (trung cap)) ((nhung chong) OR (nhung phuong)) bai toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chieu sach - thanh ((trung va) or (trung cap)) ((nhung chong) OR (nhung phuong)) bai toan cao".
• Adding a wildcard symbol may retrieve word variants: theo chieu sach - thanh ((trung va) or (trung cap)) ((nhung chong) OR (nhung phuong)) bai toan cao*.