Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
thu sach » tu sach, thuat sach, thuoc sach
duoc van » duoc va, duc van, duoc ban
sach ky » sac ky, sach y, sach ty
vai cua » hai cua, lai cua, bai cua
ve cho » ve che, de cho, ke cho
x hoi » xa hoi, o hoi, x ho
ve co » vo co, va co, de co

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky nang x hoi. hieu ((ve cho) OR (ve co)) duoc van thanh ((vai cua) or (dai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang x hoi. hieu ((ve cho) OR (ve co)) duoc van thanh ((vai cua) OR (dai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang x hoi. hieu ((ve cho) OR (ve co)) duoc van thanh ((vai cua) or (dai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang x hoi. hieu ((ve cho) OR (ve co)) duoc van thanh ((vai cua) or (dai cua)) tre*.