Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hien sach » dien sach, kien sach, thien hach
cong tan » cong tac, cong san, cong thanh
tan toan » tan tran, tap toan, van toan
toan ban » van ban
manh va » hanh va, minh va, lanh va
anh va » hanh 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 hien sach - hanh ((manh va) or (anh va)) nhung cong tan toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien sach - hanh ((manh va) OR (anh va)) nhung cong tan toan ban.
• Adding a wildcard symbol may retrieve word variants: hoc hien sach - hanh ((manh va) or (anh va)) nhung cong tan toan ban*.