Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
va thanh » gia thanh, va tinh, le thanh
yu hang » yu zhang, yu pang, yu wang
van cac » van hac, van cau, van bac
cac xuc » cam xuc, cac nuoc, chat xuc
cua tuc » cua duc, cua tu, cua thuoc
y hang » ly hang, ty hang, _ hang

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) OR (yu hang)) cau 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 ((y hang) OR (yu hang)) cau 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 ((y hang) OR (yu hang)) cau hoi. hieu van cac xuc ((va thanh) or (ban thanh)) dai cua tuc".
• Adding a wildcard symbol may retrieve word variants: toc sach ((y hang) OR (yu hang)) cau hoi. hieu van cac xuc ((va thanh) or (ban thanh)) dai cua tuc*.