Perhaps you should try some spelling variations:
chieu tinh » trieu tinh, lieu tinh, chau tinh
nhanh mang » nhanh lang, hanh mang, nhanh quang
hieu lang » chieu sang, hieu quang, nhieu tang
hang cong » hang nong, bang cong, thanh cong
dang cong » dung cong
mang cua » manh cua, dung cua, ban cua
bai toan » bai tap
toan ban » van ban

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((chieu tinh) or (hieu lang)) - nhanh mang cua ((hang cong) or (dang cong)) bai toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu tinh) OR (hieu lang)) - nhanh mang cua ((hang cong) OR (dang cong)) bai toan ban.
• Adding a wildcard symbol may retrieve word variants: ho ((chieu tinh) or (hieu lang)) - nhanh mang cua ((hang cong) or (dang cong)) bai toan ban*.