Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
toc sach » hoc sach, doc sach, nuoc sach
hieu van » hieu va, thien van, lieu va
chat duc » chat xuc, chat doc, chet duoc
van chat » cao chat
xang xa » lang xa, mang xa, ang xa
va hanh » van hanh, va thanh, va danh
vai cua » dai cua, hai cua, lai 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)) ty xang xa hoi. hieu van chat duc va hanh ((vai cuu) or (vai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (thuoc sach)) ty xang xa hoi. hieu van chat duc va hanh ((vai cuu) OR (vai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (thuoc sach)) ty xang xa hoi. hieu van chat duc va hanh ((vai cuu) or (vai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) OR (thuoc sach)) ty xang xa hoi. hieu van chat duc va hanh ((vai cuu) or (vai cua)) tre*.