Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
tieu dieu » tieu bieu, lieu dieu, tieu diem
toc sach » hoc sach, doc sach, thuoc sach
dieu cam » dieu can, dieu cua, diem cau
ky tang » ky nang, ky dang, kho tang
ky lang » ky nang, ky dang, tay lang
hanh va » hang va, hanh vi
xuc va » duc va, luc va, xac va
tuc va » thuc va, truc va, tuc xa
va cua » va chua, via cua, ca cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ((ky lang) OR (ky tang)) xa hoi. tieu dieu cam ((xuc va) or (tuc va)) hanh va cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((ky lang) OR (ky tang)) xa hoi. tieu dieu cam ((xuc va) OR (tuc va)) hanh va cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ((ky lang) OR (ky tang)) xa hoi. tieu dieu cam ((xuc va) or (tuc va)) hanh va cua triet".
• Adding a wildcard symbol may retrieve word variants: toc sach ((ky lang) OR (ky tang)) xa hoi. tieu dieu cam ((xuc va) or (tuc va)) hanh va cua triet*.