Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thu sach » tu sach, thuat sach, thuoc sach
dao dai » dat dai, dao dan, tao dai
y nang » ky nang, ly nang, may nang
v nang » va nang, vu nang, van nang
va cam » va cham, va cao, va cai
duc ca » duc cac, duc va, duc ha

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ((y nang) or (v nang)) xa hoi. lieu ((va cam) OR (va cac)) duc ca dao dai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((y nang) OR (v nang)) xa hoi. lieu ((va cam) OR (va cac)) duc ca dao dai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((y nang) or (v nang)) xa hoi. lieu ((va cam) OR (va cac)) duc ca dao dai cua triet".
• Adding a wildcard symbol may retrieve word variants: thu sach ((y nang) or (v nang)) xa hoi. lieu ((va cam) OR (va cac)) duc ca dao dai cua triet*.