Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
lai cua » dai cua, hai cua, lai chau
va danh » va dinh, va dan, va hanh
cau xuc » cam xuc, cau luc, cau truc
van cau » van dau, van hau, van chat
ky tang » ky nang, ky dang, kho tang
ky sang » ky nang, ky dang, duy sang
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ((ky sang) OR (ky tang)) xa hoi. hieu van cau xuc ((va danh) or (va thanh)) lai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ky sang) OR (ky tang)) xa hoi. hieu van cau xuc ((va danh) OR (va thanh)) lai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ky sang) OR (ky tang)) xa hoi. hieu van cau xuc ((va danh) or (va thanh)) lai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ky sang) OR (ky tang)) xa hoi. hieu van cau xuc ((va danh) or (va thanh)) lai cua tre*.