Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
thuc dan » thuc hanh, hoc dan, thuc vat
dang xay » dang van, van xay
tai cua » thai cua, tai cuc, dai cua
thuc va » thuc vat, thuc day
sach ky » sac ky, sach y, sach ty
lieu ha » lieu nha, lieu va, liem ha
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky nang, ky danh

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. lieu ha nam ((thuc va) or (thuc dan)) danh ((tai cua) OR (tri cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky dang xay hoi. lieu ha nam ((thuc va) OR (thuc dan)) danh ((tai cua) OR (tri cua)) te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky dang xay hoi. lieu ha nam ((thuc va) or (thuc dan)) danh ((tai cua) OR (tri cua)) te".
• Adding a wildcard symbol may retrieve word variants: toc sach ky dang xay hoi. lieu ha nam ((thuc va) or (thuc dan)) danh ((tai cua) OR (tri cua)) te*.