Perhaps you should try some spelling variations:
cach thuc » anh thuc, cac thu
hieu van » hieu va, thien van, lieu va
van cach » va cach, van canh, vat cach
va danh » va dinh, va dan, va hanh
thuc va » thuc vat, thuc dan, thuc day
su sach » so sach, vu sach
lang xa » lang ha, dang xay, lang van
so sanh » do sanh
y lang » o lang, _ lang, tay lang
di cua » doi cua, de cua, do cua

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sanh)) y lang xa hoi. hieu van cach thuc va danh ((di cua) OR (dai cua)) tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (so sanh)) y lang xa hoi. hieu van cach thuc va danh ((di cua) OR (dai cua)) tre~".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sanh)) y lang xa hoi. hieu van cach thuc va danh ((di cua) OR (dai cua)) tre*.