Perhaps you should try some spelling variations:
doanh vien » doanh tien, doanh chien, thanh vien
thuc day » thuc dan, thuc vat
vien cac » vien bach, vien dai, vien da
so sach » so sanh, bo sach, co sach
sach ty » sach y, sach tu, sach thu
ty tang » tay tang, ty xang, ty hang
tang xa » trang xa, tang ma, lang xa
truc va » thuc vat, trung va
thuc va » thuc vat, thuc dan
qua ca » qua cac, qua cua, qua cai

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ty tang xa hoi. hieu qua ca ((truc va) or (((thuc va) or (thuc day)))) doanh vien cac tro~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ty tang xa hoi. hieu qua ca ((truc va) OR (((thuc va) OR (thuc day)))) doanh vien cac tro.
• Adding a wildcard symbol may retrieve word variants: so sach ty tang xa hoi. hieu qua ca ((truc va) or (((thuc va) or (thuc day)))) doanh vien cac tro*.