Perhaps you should try some spelling variations:
nuoc sach » nguoi sach, hoc sach, cuoc cach
hieu van » hieu va, thien van, lieu va
van hanh » van thanh, ban hanh, van anh
cua tre » cua te, cua triet, dua tren
xuc van » duc van, luc van, vuc van
van cam » van nam, van lam, van cau
vu sach » vu bach, su sach, vu khach
sang ma » tang ma, nang ma, sang tao
ky sang » ky nang, ky dang, ky tang
cuu 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: ((vu sach) or (nuoc sach)) ky sang ma hoi. hieu van cam xuc van hanh vi ((cua tre) OR (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (nuoc sach)) ky sang ma hoi. hieu van cam xuc van hanh vi ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) or (nuoc sach)) ky sang ma hoi. hieu van cam xuc van hanh vi ((cua tre) OR (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (nuoc sach)) ky sang ma hoi. hieu van cam xuc van hanh vi ((cua tre) OR (cuu tre))*.