Perhaps you should try some spelling variations:
vat thanh » dat thanh, gat thanh, tat thanh
toc sach » hoc sach, doc sach, thuoc sach
vat hanh » van hanh, va hanh, nhat hanh
lang van » dang van, tang van, hoang van
lai cua » dai cua, hai cua, lai chau
co thuc » do thuc, co thua, mo thuc
hieu va » lieu va, hieu qua
sach cu » sach cua, sach tu, sach uu
lang xa » lang ha, dang xay
cua tre » cua te, cuu tre, cua triet
va co » vo co

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 cu ((lang xa) OR (lang van)) hoi. hieu va co thuc ((vat hanh) or (vat thanh)) lai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach cu ((lang xa) OR (lang van)) hoi. hieu va co thuc ((vat hanh) OR (vat thanh)) lai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach cu ((lang xa) OR (lang van)) hoi. hieu va co thuc ((vat hanh) or (vat thanh)) lai cua tre".
• Adding a wildcard symbol may retrieve word variants: toc sach cu ((lang xa) OR (lang van)) hoi. hieu va co thuc ((vat hanh) or (vat thanh)) lai cua tre*.