Perhaps you should try some spelling variations:
danh vien » doanh vien, danh viet, danh kien
thu sach » tu sach, thuat sach, thuoc sach
dan vien » dan viet, nhan vien, danh viet
cua truc » cua tuc, cua thuoc, cua trung
van hoc » van hoa
van hoi » van hoa, van hoe, van loi
qua cua » quan cua, quang cua, qua quan
sach ky » sac ky, sach y, sach ty
truc va » thuc va, thuc vat, trung va
ky lang » ky nang, ky dang, ky tang
da tro » de tro, va tro, da tao

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 lang ((van hoi) OR (van hoc)). hieu qua cua truc va ((danh vien) or (dan vien)) da tro~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky lang ((van hoi) OR (van hoc)). hieu qua cua truc va ((danh vien) OR (dan vien)) da tro.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky lang ((van hoi) OR (van hoc)). hieu qua cua truc va ((danh vien) or (dan vien)) da tro".
• Adding a wildcard symbol may retrieve word variants: thu sach ky lang ((van hoi) OR (van hoc)). hieu qua cua truc va ((danh vien) or (dan vien)) da tro*.