Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
long ha » dong ha, cong ha, dong hoa
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
vai cua » hai cua, lai cua, bai cua
va cam » va cham, va cac, va cao
xuc va » duc va, tuc va, luc va

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 y ((lang ha) OR (long ha)) hoi. hieu va cam xuc va hanh ((vai cua) or (dai cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y ((lang ha) OR (long ha)) hoi. hieu va cam xuc va hanh ((vai cua) OR (dai cua)) te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach y ((lang ha) OR (long ha)) hoi. hieu va cam xuc va hanh ((vai cua) or (dai cua)) te".
• Adding a wildcard symbol may retrieve word variants: toc sach y ((lang ha) OR (long ha)) hoi. hieu va cam xuc va hanh ((vai cua) or (dai cua)) te*.