Perhaps you should try some spelling variations:
thanh van » thanh san, thanh toan, thanh phan
su triet » su viet, su tien, ve triet
hieu van » hieu va, thien van, lieu va
thanh va » hanh va, thanh ha, thanh ve
cac thoi » cac toi, cac hop, cac tro
van cac » van hac, van cau, van bac
sach ty » sach y, sach tu, sach thu
thoi xa » thoi xua, thi xa, thoi va
ty nang » ky nang, ty xang, ty hang
tu sach » thu sach, su sach, te sach
nang o » nang co, nang ho, nang ro
o hai » co hai, so hai, o lai

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 ty nang o hai. hieu van cac thoi xa ((thanh va) or (thanh van)) su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang o hai. hieu van cac thoi xa ((thanh va) OR (thanh van)) su triet.
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang o hai. hieu van cac thoi xa ((thanh va) or (thanh van)) su triet*.