Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
cua triet » cua viet, su triet, va triet
cham luc » cham soc, nhan luc, cham cuu
dan dai » dat dai, can dai, dan dat
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
tu sach » thu sach, su sach, te sach
luc va » duc va, tuc va, loc va
va dan » ca dan, va dao, va dau
x hoi » xa hoi, x ho, 5 hoi
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: ((tu sach) or (thuoc sach)) ky nang ((x hoi) OR (o hoi)). hieu ve cham luc va dan dai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thuoc sach)) ky nang ((x hoi) OR (o hoi)). hieu ve cham luc va dan dai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thuoc sach)) ky nang ((x hoi) OR (o hoi)). hieu ve cham luc va dan dai cua triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thuoc sach)) ky nang ((x hoi) OR (o hoi)). hieu ve cham luc va dan dai cua triet*.