Perhaps you should try some spelling variations:
dan thanh » dang thanh, danh thanh, ban thanh
toc sach » hoc sach, doc sach, thuoc sach
cam thuc » am thuc, nam thuc, cam thu
cay phoi » cap phoi, cay cho, gap phoi
thuc dan » thuc hanh, hoc dan, thuc vat
vai cua » hai cua, lai cua, bai cua
hieu ve » hieu va, hieu van
tay hoi » tay ho, tao hoi, tay thai
ve cam » ve cham, ve cac, va cam
y dang » ky dang, 2 dang, _ dang

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 y dang ((cay phoi) or (tay hoi)). hieu ve cam thuc dan thanh ((vai cua) or (dai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y dang ((cay phoi) OR (tay hoi)). hieu ve cam thuc dan thanh ((vai cua) OR (dai cua)) tre.
• Adding a wildcard symbol may retrieve word variants: toc sach y dang ((cay phoi) or (tay hoi)). hieu ve cam thuc dan thanh ((vai cua) or (dai cua)) tre*.