Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
toc sach » hoc sach, doc sach, nuoc sach
cham tuc » nham thuc, pham thuc, tham thuc
lang van » dang van, tang van, hoang van
va thanh » gia thanh, ban thanh, va tinh
vai cua » dai cua, hai cua, lai cua
va cham » va chat, va tham
hieu va » lieu va, hieu qua
tuc va » thuc va, truc va, tuc xa
y lang » o lang, _ lang, tay lang
vi cua » di 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) or (thuoc sach)) y lang van hoa. hieu va cham tuc va thanh ((vi cua) OR (vai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (thuoc sach)) y lang van hoa. hieu va cham tuc va thanh ((vi cua) OR (vai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) or (thuoc sach)) y lang van hoa. hieu va cham tuc va thanh ((vi cua) OR (vai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (thuoc sach)) y lang van hoa. hieu va cham tuc va thanh ((vi cua) OR (vai cua)) tre*.