Perhaps you should try some spelling variations:
hanh vai » hanh va, hanh tai, hanh van
hieu van » hieu va, thien van, lieu va
su sach » so sach
tuc ban » thuc ban, truc ban, tu ban
hoc tuc » hoc thuc, hoc truc, hoc tu
van hoc » van hoa
nang ma » tang ma, sang ma, nang cao
vu sach » vu bach, vu khach
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) OR (vu sach)) ky nang ma hoi. hieu van hoc tuc ban ((hanh vai) or (hanh vi)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) ky nang ma hoi. hieu van hoc tuc ban ((hanh vai) OR (hanh vi)) cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (vu sach)) ky nang ma hoi. hieu van hoc tuc ban ((hanh vai) or (hanh vi)) cuu tre*".