Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
hai cua » thai cua, hoi cua, lai cua
cam duc » cam xuc, cao duc, nam duoc
hieu ve » hieu va, hieu van
tang ma » mang may, tang van
ky tang » ky nang, ky dang, kho tang
ma hoi » mai hoi, xa hoi, ma hoa

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

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