Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
hanh vai » hanh va, hanh tai, hanh van
thu sach » thuat sach, thuoc sach, thu hoach
dang mai » dang hai, dang mau, dang bai
van cam » van nam, van lam, van cau
tu sach » su sach, te sach, tu cach
mai hoi » mai khoi, dai hoi, lai hoi
ky dang » ky nang, ky danh
cuu tre » cua tre, cau tren, cau treo
xuc va » duc va, tuc va, luc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) OR (thu sach)) ky dang mai hoi. hieu van cam xuc va ((hanh vai) or (hanh vi)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky dang mai hoi. hieu van cam xuc va ((hanh vai) OR (hanh vi)) cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) ky dang mai hoi. hieu van cam xuc va ((hanh vai) or (hanh vi)) cuu tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (thu sach)) ky dang mai hoi. hieu van cam xuc va ((hanh vai) or (hanh vi)) cuu tre*.