Perhaps you should try some spelling variations:
danh viet » anh viet, ninh viet, nang viet
danh vien » doanh vien, dan vien, danh kien
sach ky » sac ky, sach y, sach kem
sach ty » sach y, sach tu, sach thu
lang xa » lang ha, dang xay, lang van
qua cau » quan cau, qua cac, qua ca
truc va » thuc va, thuc vat, trung va

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

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