Perhaps you should try some spelling variations:
nhung chong » nhung cong, nhung phong, nhung phuong
theo chieu » theo tieu, ho chieu, theo chu
chieu xanh » chieu sach, chieu sang, chieu tinh
chong bai » cuong bai, thong bai, chong lai
trung va » truong va, trang va, trung tam
trung ha » trung hoc, trung tam, trung cap
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 xanh - thanh ((trung va) OR (trung ha)) nhung chong bai toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chieu xanh - thanh ((trung va) OR (trung ha)) nhung chong bai toan cao".
• Adding a wildcard symbol may retrieve word variants: theo chieu xanh - thanh ((trung va) OR (trung ha)) nhung chong bai toan cao*.