Perhaps you should try some spelling variations:
thieu sach » chieu sach, hieu cach, theo sach
thien hach » thien thanh, hien hanh
nhung cong » thong cong, hang cong, nhung don
ganh nang » anh nang, nganh nong, van nang
dung cong » dung trong
van thanh » ban thanh, van tuan
thanh ban » thanh san, thanh van, thanh bac

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thieu sach) or (thien hach)) - ganh nang cao ((nhung cong) or (dung cong)) van thanh ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sach) OR (thien hach)) - ganh nang cao ((nhung cong) OR (dung cong)) van thanh ban.
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sach) or (thien hach)) - ganh nang cao ((nhung cong) or (dung cong)) van thanh ban*.