Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
tinh lai » tinh lao, minh lai, tinh bai
tinh hai » tinh thai, tinh chat, trinh han
tu sach » thu sach, su sach, te sach
van cac » van hac, van cau, van bac
day may » dat may, dau may, tay may
y nang » ky nang, ly nang, v nang
x hoi » xa hoi, o hoi, x ho

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 y nang x hoi. hieu van cac ((day may) or (dam may)) ((tinh lai) or (tinh hai)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang x hoi. hieu van cac ((day may) OR (dam may)) ((tinh lai) OR (tinh hai)) cua triet.
• Adding a wildcard symbol may retrieve word variants: tu sach y nang x hoi. hieu van cac ((day may) or (dam may)) ((tinh lai) or (tinh hai)) cua triet*.