Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
vien cac » vien bach, vien dai, gian cac
vien da » vien dai, hien dai
xuc van » duc van, luc van, vuc van
ban thi » dan thi, van thi, can thi
thi cua » thai cua, thi cuc, tri cua
tu sach » thu sach, su sach, te sach
tu can » tu ban, tu cac, thu canh
nang o » nang co, nang ho, nang ro
o lai » o lao

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 (tu can)) ky nang o lai. hieu ((vien cac) or (vien da)) xuc van ban thi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (tu can)) ky nang o lai. hieu ((vien cac) OR (vien da)) xuc van ban thi cua triet.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (tu can)) ky nang o lai. hieu ((vien cac) or (vien da)) xuc van ban thi cua triet*.