Perhaps you should try some spelling variations:
thieu sach » chieu sach, hieu cach, theo sach
thien hach » thien thanh, hien hanh
nhung cong » dung cong, thong cong, nhung don
hanh nang » anh nang, ganh nang, hanh mang
hang cong » dang cong, hang nong, bang cong
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)) - hanh nang cao ((nhung cong) OR (hang cong)) van thanh ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sach) OR (thien hach)) - hanh nang cao ((nhung cong) OR (hang cong)) van thanh ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu sach) or (thien hach)) - hanh nang cao ((nhung cong) OR (hang cong)) van thanh ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sach) or (thien hach)) - hanh nang cao ((nhung cong) OR (hang cong)) van thanh ban*.