Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
toc sach » hoc sach, doc sach, thuoc sach
tay lang » tai lang, tay tang, tay quang
thanh ve » hanh ve, thanh va, thanh vien
thuc van » thuc vat, thuc dan, thuc va
sach tay » xach tay, sach hay, sach nay
va cham » va chat, va tham
cua tre » cua te, cuu tre, cua triet
ve cham » ve chat, vu cham, ve chim
van hoi » van hoc, van hoe, van loi
ve cua » le cua, de cua, te cua

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 tay lang ((van hoi) OR (van hoa)). hieu ((ve cham) or (va cham)) thuc van thanh ve cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach tay lang ((van hoi) OR (van hoa)). hieu ((ve cham) OR (va cham)) thuc van thanh ve cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach tay lang ((van hoi) OR (van hoa)). hieu ((ve cham) or (va cham)) thuc van thanh ve cua tre".
• Adding a wildcard symbol may retrieve word variants: toc sach tay lang ((van hoi) OR (van hoa)). hieu ((ve cham) or (va cham)) thuc van thanh ve cua tre*.