Perhaps you should try some spelling variations:
cham luc » cham soc, nhan luc, cham cuu
va cham » va chat, va tham
hieu va » lieu va, hieu qua
te sach » toc sach
ty hang » ly hang, ty xang, thi hang
cua tre » cua te, cuu tre, cua triet
va dan » va dao, va dau, va dap
ca dan » cac dan, ca dao
di cua » dai cua, doi cua, de cua

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

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