Perhaps you should try some spelling variations:
vu sach » vu bach, vu khach
su sach » so sach
ky lang » ky dang, ky tang, tay lang
hieu ke » hieu kem, chieu ke, hieu ky
cau luc » cau truc, cau phuc
luc may » truc may, phuc may
tinh va » tich va, trinh van, trinh vat
cua tre » cua te, cuu tre, cua triet
ke cau » ket cau
va cua » va chua, via cua, ca cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((vu sach) OR (su sach)) ((ky lang) or (ky nang)) xa hoi. hieu ke cau luc may tinh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (su sach)) ((ky lang) OR (ky nang)) xa hoi. hieu ke cau luc may tinh va cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) OR (su sach)) ((ky lang) or (ky nang)) xa hoi. hieu ke cau luc may tinh va cua tre".
• Adding a wildcard symbol may retrieve word variants: ((vu sach) OR (su sach)) ((ky lang) or (ky nang)) xa hoi. hieu ke cau luc may tinh va cua tre*.