Perhaps you should try some spelling variations:
dat thanh » dao thanh, dat khanh, dang thanh
va triet » va thiet, va trien, ve triet
thanh vi » hanh vi, thanh va, thanh ve
truc dat » truc dai, truc dan, truoc dam
tu sach » thu sach, su sach, tu cach
ky lang » ky nang, ky dang, ky tang
lang ha » long ha
te sach » toc sach
ha hoi » hoa hoi, ha noi, xa hoi
va cau » van cau, va dau, va cao
vi va » vi van, vai va, vu va

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ky lang ha hoi. hieu ((va cau) OR (va cac)) truc dat thanh vi va triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (te sach)) ky lang ha hoi. hieu ((va cau) OR (va cac)) truc dat thanh vi va triet~".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) ky lang ha hoi. hieu ((va cau) OR (va cac)) truc dat thanh vi va triet*.