Perhaps you should try some spelling variations:
cham luc » cham soc, nhan luc, cham cuu
hoc sach » hoc sinh, hoc cac, hoc anh
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
tu sach » thu sach, su sach, te sach
cua tre » cua te, cuu tre, cua triet
va dan » ca dan, va dau, va dap
va dao » 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: ((tu sach) or (hoc sach)) ky nang x ho. hieu ve cham luc ((va dan) OR (va dao)) di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (hoc sach)) ky nang x ho. hieu ve cham luc ((va dan) OR (va dao)) di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (hoc sach)) ky nang x ho. hieu ve cham luc ((va dan) OR (va dao)) di cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (hoc sach)) ky nang x ho. hieu ve cham luc ((va dan) OR (va dao)) di cua tre*.