Perhaps you should try some spelling variations:
cham luc » cham soc, nhan luc, cham cuu
su sach » so sach, vu sach
va cham » va chat, va tham
va tinh » may tinh
tinh da » tinh va, tinh gia, tinh lao
cua tre » cuu tre, cua triet, dua tren
nang o » nang co, nang ho, nang ro
luc va » duc va, tuc va, loc va
cua te » cua tu
o hoc » co hoc, mo hoc, so hoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu cac) or (su sach)) ky nang o hoc. lieu va cham luc va tinh da ((cua tre) OR (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cac) OR (su sach)) ky nang o hoc. lieu va cham luc va tinh da ((cua tre) OR (cua te))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu cac) or (su sach)) ky nang o hoc. lieu va cham luc va tinh da ((cua tre) OR (cua te))*".