Perhaps you should try some spelling variations:
doanh cua » doanh luan
cau tren » cu tren, dau tren, ca tren
va doanh » van doanh, vay doanh, va danh
nam thuc » nam thuoc, am thuc, nam thu
hieu van » hieu va, thien van, lieu va
cua cau » cua cac, cua chu, cua cay
thuc va » thuc vat, thuc dan, thuc day
tu sach » thu sach, te sach, tu cach
so sanh » do sanh
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
y nang » ky nang, ly nang, v nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (((su sach) or (so sanh)))) y nang xa hoi. hieu van nam thuc va doanh cua cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (((su sach) OR (so sanh)))) y nang xa hoi. hieu van nam thuc va doanh cua cau tren.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (((su sach) or (so sanh)))) y nang xa hoi. hieu van nam thuc va doanh cua cau tren*.