Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
nam thuc » nam thuoc, am thuc, nam thu
dang xay » dang van, van xay
vu sach » vu bach, su sach, vu khach
cua tre » cua te, cuu tre, cua triet
nang di » nang du, hang di, nang ji
va nang » van nang, da nang, cam nang
thuc va » thuc vat, thuc dan, thuc day
hieu ve » hieu va, hieu van
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky nang, ky danh
ve nam » he nam, va nam, le nam
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((vu sach) or (thuoc sach)) ky dang xay hoi. hieu ve nam thuc va nang di ((cua tre) or (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (thuoc sach)) ky dang xay hoi. hieu ve nam thuc va nang di ((cua tre) OR (cua tu)).
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (thuoc sach)) ky dang xay hoi. hieu ve nam thuc va nang di ((cua tre) or (cua tu))*.