Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
hieu van » hieu va, thien van, lieu va
thanh vi » hanh vi, thanh va, thanh ve
hoc giai » hoc giao, hoc dai, so giai
van cham » van chat, van tham, va cham
sang ma » tang ma, nang ma, sang tao
hoc gia » hoc giao, toc gia, quoc gia
ky sang » ky nang, ky dang, ky tang
te sach » toc sach
ma hoi » mai hoi, xa hoi, ma hoa
vi cua » vai cua, di cua

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 (vu bach)) ky sang ma hoi. hieu van cham ((hoc gia) OR (hoc giai)) thanh vi cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (vu bach)) ky sang ma hoi. hieu van cham ((hoc gia) OR (hoc giai)) thanh vi cua viet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (vu bach)) ky sang ma hoi. hieu van cham ((hoc gia) OR (hoc giai)) thanh vi cua viet*".