Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
nhanh mang » nhanh lang, hanh mang, nhanh quang
thong cong » trong cong, tong cong, thong thong
hieu lang » chieu sang, hieu quang, nhieu tang
cong san » cong tac
toan cau » toan cao, toan ban, toan tai
toan tap » toan ban
mang he » bang he, mang ke, mang se

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((hieu lang) or (chieu sach)) - nhanh mang he thong cong san ((toan cau) or (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((hieu lang) OR (chieu sach)) - nhanh mang he thong cong san ((toan cau) OR (toan tap)).
• Adding a wildcard symbol may retrieve word variants: theo ((hieu lang) or (chieu sach)) - nhanh mang he thong cong san ((toan cau) or (toan tap))*.