Perhaps you should try some spelling variations:
trinh thanh » tinh thanh, trinh han, trinh toan
chieu sach » chinh sach, chiet tach, chieu sang
nhung cong » dung cong, thong cong, hang cong
doi chieu » doc hieu, doi chi, ho chieu
thong qua » thong cua, thong tu, duong qua
thanh cau » thanh chau, thanh mau, nhanh cau

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 - thanh ((thong qua) or (thong quan)) nhung cong trinh thanh cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - thanh ((thong qua) OR (thong quan)) nhung cong trinh thanh cau.
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - thanh ((thong qua) or (thong quan)) nhung cong trinh thanh cau*.