Perhaps you should try some spelling variations:
chiet tach » chieu sach
nhung cong » dung cong, hang cong, nhung don
thong cong » trong cong, tong cong, thong thong
hoc chiet » hoc thiet, hoc nhiet, hoc hien
manh toan » thanh toan, anh tuan, tinh toan
toan ban » van ban
tung va » trung va, tuong va, vung va

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc chiet tach - thanh ((tung va) or (dung va)) ((nhung cong) or (thong cong)) manh toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chiet tach - thanh ((tung va) OR (dung va)) ((nhung cong) OR (thong cong)) manh toan ban.
• Adding a wildcard symbol may retrieve word variants: hoc chiet tach - thanh ((tung va) or (dung va)) ((nhung cong) or (thong cong)) manh toan ban*.