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

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 xa hoi. hieu van cac ((day may) OR (dat 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 xa hoi. hieu van cac ((day may) OR (dat may)) ((tinh lai) OR (tinh hai)) cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang xa hoi. hieu van cac ((day may) OR (dat may)) ((tinh lai) or (tinh hai)) cua triet".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang xa hoi. hieu van cac ((day may) OR (dat may)) ((tinh lai) or (tinh hai)) cua triet*.