Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
va thanh » gia thanh, ban thanh, va tinh
sach ty » sach y, sach tu, sach thu
cua tre » cua te, cuu tre, dua tren
su sach » so sach, vu sach
bao duc » dao duc, bao luc, cao duc
van bao » van ban, van dao
nang ma » tang ma, sang ma, nang cao
ty nang » ky nang, ty xang, ty hang
va hanh » van hanh, va danh, ban hanh
ma hoi » mai hoi, xa hoi, ma hoa

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: su sach ty nang ma hoi. hieu van bao duc ((va hanh) OR (va thanh)) than ((cua tre) OR (cua triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty nang ma hoi. hieu van bao duc ((va hanh) OR (va thanh)) than ((cua tre) or (cua triet))~".
• Adding a wildcard symbol may retrieve word variants: su sach ty nang ma hoi. hieu van bao duc ((va hanh) OR (va thanh)) than ((cua tre) or (cua triet))*.