Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
thanh vi » hanh vi, thanh va, thanh ve
ty nang » ky nang, ty xang, ty hang
van bac » van ban, van bao, van hac
bo van » so van, do van, ho van
vi cua » vai cua, di cua
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: ((te sach) OR (toc sach)) ty nang x hoi. hieu van bac ((bo van) or (vo van)) thanh vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ty nang x hoi. hieu van bac ((bo van) OR (vo van)) thanh vi cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) ty nang x hoi. hieu van bac ((bo van) or (vo van)) thanh vi cua triet".
• Adding a wildcard symbol may retrieve word variants: ((te sach) OR (toc sach)) ty nang x hoi. hieu van bac ((bo van) or (vo van)) thanh vi cua triet*.