Perhaps you should try some spelling variations:
doanh moi » doanh tai, dinh moi, thanh moi
nham thuc » nhan thuc, nam thuc, nham thu
hanh vii » hanh voi, hanh va, hanh noi
danh mai » danh sai, dinh moi, bach mai
tu sach » thu sach, su sach, te sach
ve nham » ve nha, ve cham
thuc va » thuc vat, thuc dan, thuc day
hieu ve » hieu va, hieu van
sach ty » sach y, sach tu, sach thu
cu tren » tu tren, dua tren

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 ty ((danh mai) or (doanh moi)) hoi. hieu ve nham thuc va ((hanh vii) or (hanh vi)) cu tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty ((danh mai) OR (doanh moi)) hoi. hieu ve nham thuc va ((hanh vii) OR (hanh vi)) cu tren.
• Adding a wildcard symbol may retrieve word variants: tu sach ty ((danh mai) or (doanh moi)) hoi. hieu ve nham thuc va ((hanh vii) or (hanh vi)) cu tren*.