Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hac thuc » hoc thuc, ha thuc, thach thuc
hanh vai » hanh va, hanh tai, hanh van
thuc ban » thuoc ban, thuc dan, thu ban
hieu van » hieu va, thien van, lieu va
van hac » van hoc, van ha, van hai
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
cua tre » cua te, cuu tre, dua tren
su sach » so sach, vu sach
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky nang ma hoi. hieu van hac thuc ban ((hanh vai) or (hanh vi)) ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ma hoi. hieu van hac thuc ban ((hanh vai) OR (hanh vi)) ((cua tre) OR (cua triet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang ma hoi. hieu van hac thuc ban ((hanh vai) or (hanh vi)) ((cua tre) OR (cua triet))*".