Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
so sach » so sanh, bo sach, co sach
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo
sach ky » sac ky, sach y, sach ty
cam luc » cam xuc, cau luc
van cam » van nam, van lam, van cau
nang ma » tang ma, sang ma, nang cao
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: so sach ky nang ma hoi. hieu van cam luc ((va tinh) or (may tinh)) cac ((cua tre) OR (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky nang ma hoi. hieu van cam luc ((va tinh) OR (may tinh)) cac ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky nang ma hoi. hieu van cam luc ((va tinh) or (may tinh)) cac ((cua tre) OR (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: so sach ky nang ma hoi. hieu van cam luc ((va tinh) or (may tinh)) cac ((cua tre) OR (cuu tre))*.