Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thien van » thi van
hieu van » hieu va, lieu va, hieu ve
tinh lai » tinh lao, minh lai, tinh bai
tinh hai » tinh thai, tinh chat, trinh han
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
cac dam » cac dan, cac dai, cao dam
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) OR (thien van)) cac 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 xa hoi. ((hieu van) OR (thien van)) cac dam 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) OR (thien van)) cac dam may ((tinh lai) or (tinh hai)) cua triet".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang xa hoi. ((hieu van) OR (thien van)) cac dam may ((tinh lai) or (tinh hai)) cua triet*.