Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
thuc dan » thuc hanh, hoc dan, thuc vat
cac treo » cac tro, cau treo, cac trieu
dang xay » dang van, van xay
xay hoi » xa hoi, tay hoi, cay phoi
hieu va » lieu va, hieu qua
sach ky » sac ky, sach y, sach ty
thuc va » thuc vat, thuc day
ky dang » ky nang, ky danh
dan vai » dan va, dan tai, dan vat
vai cac » va cac, tai cac, voi cac
va nam » van nam, ha nam, va nay

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ky dang xay hoi. hieu va nam ((thuc va) or (thuc dan)) dan vai cac treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky dang xay hoi. hieu va nam ((thuc va) OR (thuc dan)) dan vai cac treo.
• Adding a wildcard symbol may retrieve word variants: toc sach ky dang xay hoi. hieu va nam ((thuc va) or (thuc dan)) dan vai cac treo*.