Perhaps you should try some spelling variations:
danh vien » doanh vien, danh viet, dan vien
thu sach » tu sach, thuat sach, thuoc sach
hieu cua » hieu qua, dieu cua, bieu cua
cac truc » cau truc, cac tru, cac trung
vien cac » vien bach, vien dai, vien da
sach ty » sach y, sach tu, sach thu
dang xa » dang xay, lang xa, dang va
dang ha » dong ha, dung ha, lang ha
truc va » thuc va, thuc vat, trung va
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 ty ((dang xa) or (dang ha)) hoi. hieu cua cac truc va danh vien cac tro~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty ((dang xa) OR (dang ha)) hoi. hieu cua cac truc va danh vien cac tro.
• Adding a wildcard symbol may retrieve word variants: thu sach ty ((dang xa) or (dang ha)) hoi. hieu cua cac truc va danh vien cac tro*.