Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
hieu te » hieu ve, hien te, hieu he
te ban » te bao
so vat » so van
vi cau » va cau, ve cau, di cau
x hoi » o hoi, x ho, 5 hoi
bo va » bao va, do va, so va

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 nang ((x hoi) or (xa hoi)). hieu te ban ((bo va) or (so vat)) hanh vi cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ((x hoi) OR (xa hoi)). hieu te ban ((bo va) OR (so vat)) hanh vi cau tren.
• Adding a wildcard symbol may retrieve word variants: su sach ky nang ((x hoi) or (xa hoi)). hieu te ban ((bo va) or (so vat)) hanh vi cau tren*.