Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
toc sach » hoc sach, doc sach, thuoc sach
dang tay » dang xay, dung tay, dan tay
hieu van » hieu va, thien van, lieu va
cam thuc » am thuc, nam thuc, cam thu
thuc van » thuc vat, thuc dan, thuc va
tay hoi » tay ho, tao hoi, tay thai
van cam » van nam, van lam, van cau
ban cua » ban quan
sach o » sach lo, sac o, sach y
o dang » xo dang, do dang, so 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 o dang tay hoi. hieu van cam thuc van thanh ((ban cua) or (dai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach o dang tay hoi. hieu van cam thuc van thanh ((ban cua) OR (dai cua)) tre.
• Adding a wildcard symbol may retrieve word variants: toc sach o dang tay hoi. hieu van cam thuc van thanh ((ban cua) or (dai cua)) tre*.