Perhaps you should try some spelling variations:
danh viet » anh viet, ninh viet, nang viet
dan vien » dan viet, nhan vien, dang viet
tu sach » thu sach, su sach, te sach
qua cau » quan cau, qua cac, qua ca
truc va » thuc va, thuc vat, trung va
y lang » o lang, tay lang, yen lang
_ lang » o lang, _ land

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ((y lang) OR (_ lang)) xa hoi. hieu qua cau truc va ((dan vien) or (danh viet)) cac tro~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((y lang) OR (_ lang)) xa hoi. hieu qua cau truc va ((dan vien) OR (danh viet)) cac tro.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((y lang) OR (_ lang)) xa hoi. hieu qua cau truc va ((dan vien) or (danh viet)) cac tro".
• Adding a wildcard symbol may retrieve word variants: tu sach ((y lang) OR (_ lang)) xa hoi. hieu qua cau truc va ((dan vien) or (danh viet)) cac tro*.