Perhaps you should try some spelling variations:
cong trong » cong thuong, duong trong, cong trinh
hoc chieu » hoc thieu, ho chieu, hoc hien
cong thuc » cong tac
thuc cong » thuoc cong, thu cong, chuc cong
trong dan » trong dang, trong san, trong tan
dan phan » doan phan, dan chan, van phan
phan dau » phan tu, hang dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc chieu) or (toc thieu)) sach - thanh cong thuc cong trong dan phan dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc chieu) OR (toc thieu)) sach - thanh cong thuc cong trong dan phan dau*.