Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
nha thuc » nhan thuc, nha thuoc, nham thuc
vat hang » van hang, dat hang, va hang
ky dang » ky nang, ky danh
dang xa » dang xay, lang xa, dang ha
tai cua » thai cua, tri cua, dai cua
va nha » va nho, ve nha

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) or (toc sach)) ky dang xa hoi. lieu va nha thuc vat hang ((tai cua) OR (tai cuc)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ky dang xa hoi. lieu va nha thuc vat hang ((tai cua) OR (tai cuc)) tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (toc sach)) ky dang xa hoi. lieu va nha thuc vat hang ((tai cua) OR (tai cuc)) tre*".