Perhaps you should try some spelling variations:
hanh vai » hanh va, hanh tai, hanh van
thuc ban » thuoc ban, thuc dan, thu ban
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
tuc ban » truc ban, tu ban, tuc dan
van hac » van hoc, van ha, van hai
tang ma » mang may, tang van
ky tang » ky nang, ky dang, kho tang
cuu tre » cua tre, cau tren, cau treo
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 tang ma hoi. hieu van hac ((tuc ban) OR (thuc ban)) ((hanh vai) or (hanh vi)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky tang ma hoi. hieu van hac ((tuc ban) OR (thuc ban)) ((hanh vai) OR (hanh vi)) cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky tang ma hoi. hieu van hac ((tuc ban) OR (thuc ban)) ((hanh vai) or (hanh vi)) cuu tre*".