Perhaps you should try some spelling variations:
sach thue » sach thu, sach thieu, sach tham
tam thuc » tham thuc, am thuc, nam thuc
van danh » van doanh, van anh, van hanh
thuc van » thuc vat, thuc dan, thuc va
hieu cua » hieu qua, dieu cua, bieu cua
sach ty » sach y, sach tu, sach thu
lang xa » lang ha, dang xay, lang van
gia cua » gian cua, giau cua, gia cuc
va cua » va chua, via cua, ca 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 ty) or (sach thue)) lang xa hoi. hieu cua tam thuc van danh ((va cua) or (gia cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sach ty) OR (sach thue)) lang xa hoi. hieu cua tam thuc van danh ((va cua) OR (gia cua)) tre.
• Adding a wildcard symbol may retrieve word variants: toc ((sach ty) or (sach thue)) lang xa hoi. hieu cua tam thuc van danh ((va cua) or (gia cua)) tre*.