Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
toc sach » doc sach, thuoc sach, nuoc sach
va thanh » gia thanh, va tinh, le thanh
hieu van » hieu va, thien van, lieu va
hoc sach » hoc sinh, hoc cac, hoc anh
hang ca » hang va, nang cao, hang tai
ty hang » ly hang, ty xang, thi hang
van cac » van hac, van cau, van bac
cac xuc » cam xuc, cac nuoc, chat xuc
cua tuc » cua duc, cua tu, cua thuoc
ca hoi » cau hoi, cua hoi, xa hoi

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 (hoc sach)) ty hang ca hoi. hieu van cac xuc ((va thanh) OR (ban thanh)) dai cua tuc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (hoc sach)) ty hang ca hoi. hieu van cac xuc ((va thanh) OR (ban thanh)) dai cua tuc.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) or (hoc sach)) ty hang ca hoi. hieu van cac xuc ((va thanh) OR (ban thanh)) dai cua tuc".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (hoc sach)) ty hang ca hoi. hieu van cac xuc ((va thanh) OR (ban thanh)) dai cua tuc*.