Perhaps you should try some spelling variations:
doanh van » doan van, doanh va, doanh ban
vay doanh » van doanh, ly doanh, voi doanh
nham thuc » nhan thuc, nam thuc, nham thu
thuc vay » thuc vat, thuc day, thuc va
thu sach » thuat sach, thuoc sach, thu hoach
tu sach » su sach, te sach, vu sach
van cua » vang cua, ban cua, dan cua
va nham » va cham, va tham, va nha
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
nang ma » tang ma, sang ma, nang cao
tu cach » tu cac
ma hoi » mai hoi, xa hoi, ma hoa

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 (tu cach))) or (thu sach)) ky nang ma hoi. hieu va nham thuc vay doanh van cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((tu sach) OR (tu cach))) OR (thu sach)) ky nang ma hoi. hieu va nham thuc vay doanh van cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((tu sach) OR (tu cach))) or (thu sach)) ky nang ma hoi. hieu va nham thuc vay doanh van cua tre".
• Adding a wildcard symbol may retrieve word variants: ((((tu sach) OR (tu cach))) or (thu sach)) ky nang ma hoi. hieu va nham thuc vay doanh van cua tre*.