Perhaps you should try some spelling variations:
doanh vien » doanh tien, doanh chien, thanh vien
thu sach » tu sach, thuat sach, thuoc sach
vien cac » vien bach, vien dai, vien da
sach ky » sac ky, sach y, sach ty
ky dang » ky nang, ky danh
dang xa » dang xay, lang xa, dang ha
qua cai » qua hai, qua cac, qua ca
thuc va » thuc dan, thuc day

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 dang xa hoi. hieu qua cai ((thuc vat) or (thuc va)) doanh vien cac tro~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky dang xa hoi. hieu qua cai ((thuc vat) OR (thuc va)) doanh vien cac tro.
• Adding a wildcard symbol may retrieve word variants: thu sach ky dang xa hoi. hieu qua cai ((thuc vat) or (thuc va)) doanh vien cac tro*.