Perhaps you should try some spelling variations:
cau treo » cau tren, cau triet, cau trieu
cau theo » cau thi, cau tao
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
hanh va » hang va, hanh vi
ve cac » va cac, vien cac
loc va » hoc va, luc va
x hoi » xa hoi, o hoi, x ho

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 nang x hoi. hieu ve cac ((loc va) or (duc va)) hanh va ((cau treo) or (cau theo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang x hoi. hieu ve cac ((loc va) OR (duc va)) hanh va ((cau treo) OR (cau theo)).
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang x hoi. hieu ve cac ((loc va) or (duc va)) hanh va ((cau treo) or (cau theo))*.