Perhaps you should try some spelling variations:
sach song » sach dung
song dang » song dong, song danh, song hang
van tuan » van quan, van ban, anh tuan
thuc van » thuc vat, thuc dan, thuc va
cam thuc » am thuc, nam thuc, cam thu
te sach » toc sach
hai cua » thai cua, hoi cua, lai cua
hieu ve » hieu va, hieu van
tay hoi » tao hoi, tay thai
ve cam » ve cham, ve cac, va cam
tay ho » tay co, tay o, tay khao

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 song dang ((tay hoi) OR (tay ho)). hieu ve cam thuc van tuan ((hai cua) or (dai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach song dang ((tay hoi) OR (tay ho)). hieu ve cam thuc van tuan ((hai cua) OR (dai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach song dang ((tay hoi) OR (tay ho)). hieu ve cam thuc van tuan ((hai cua) or (dai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: te sach song dang ((tay hoi) OR (tay ho)). hieu ve cam thuc van tuan ((hai cua) or (dai cua)) tre*.