Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
van cac » van hac, van cau, van bac
cua tuc » cua duc, cua tu, cua thuoc
y hang » ly hang, ty hang, yu hang
ca hoi » cua hoi, xa hoi, co hoi
xuc va » tuc va, luc va, xac 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 hang ((ca hoi) or (cau hoi)). hieu van cac ((xuc va) OR (duc va)) thanh dai cua tuc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y hang ((ca hoi) OR (cau hoi)). hieu van cac ((xuc va) OR (duc va)) thanh dai cua tuc.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach y hang ((ca hoi) or (cau hoi)). hieu van cac ((xuc va) OR (duc va)) thanh dai cua tuc".
• Adding a wildcard symbol may retrieve word variants: toc sach y hang ((ca hoi) or (cau hoi)). hieu van cac ((xuc va) OR (duc va)) thanh dai cua tuc*.