Perhaps you should try some spelling variations:
danh vien » doanh vien, danh viet, dan vien
thu sach » tu sach, thuat sach, thuoc sach
tay lang » tai lang, tay tang, tay quang
cac truc » cac tru, cac trung, sach truc
vien cac » vien bach, vien dai, vien da
ky dang » ky nang, ky danh
va danh » va dinh, va dan, va hanh

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