Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
van cham » van chat, van tham, va cham
cham duc » pham duc, cham soc, pham duy
va danh » va dinh, va dan, va hanh
lai cua » dai cua, hai cua, thai cua
ang xa » lang xa, mang xa, dang xay

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) or (toc sach)) y ang xa hoi. hieu van cham duc va danh ((lai cua) OR (lai chau)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) y ang xa hoi. hieu van cham duc va danh ((lai cua) OR (lai chau)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (toc sach)) y ang xa hoi. hieu van cham duc va danh ((lai cua) OR (lai chau)) tre".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) y ang xa hoi. hieu van cham duc va danh ((lai cua) OR (lai chau)) tre*.