Perhaps you should try some spelling variations:
nguoi san » nguoi tay, nguoi dao, nguoi ma
cua triet » cua viet, su triet, va triet
chau thi » chu thi, chau phi, chau tho
van hanh » van thanh, ban hanh, van anh
hieu ve » hieu va, hieu van
hanh de » hanh ve, hanh kem
cua tre » cua te, cuu tre, dua tren
san ky » sang ky, van ky, dan ky
nang o » nang co, nang ho, nang ro
o hoi » co hoi, o hoc, o hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: nguoi san ky nang o hoi. hieu ve ((chau thi) OR (cau thi)) van hanh de ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: nguoi san ky nang o hoi. hieu ve ((chau thi) OR (cau thi)) van hanh de ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "nguoi san ky nang o hoi. hieu ve ((chau thi) OR (cau thi)) van hanh de ((cua tre) or (cua triet))".
• Adding a wildcard symbol may retrieve word variants: nguoi san ky nang o hoi. hieu ve ((chau thi) OR (cau thi)) van hanh de ((cua tre) or (cua triet))*.