Perhaps you should try some spelling variations:
nhanh mang » nhanh lang, hanh mang, nhanh quang
chieu sach » chinh sach, chiet tach, chieu sang
thong cong » trong cong, tong cong, thong thong
doi chieu » doc hieu, doi chi, ho chieu
anh tang » anh bang, anh dang, anh nang
cong tam » cong tac, cong tan, cong nam
tam toan » tap toan, tam than, pham toan
toan cau » 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: doi chieu sach - ((anh tang) or (nhanh mang)) he thong cong tam toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - ((anh tang) OR (nhanh mang)) he thong cong tam toan cau.
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - ((anh tang) or (nhanh mang)) he thong cong tam toan cau*.