Perhaps you should try some spelling variations:
tinh vai » tinh va, tinh hai, tinh bai
nang xay » dang xay, nganh xay, nang xuan
sach ky » sach y, sach ty, sach kem
cua tre » cua te, cua triet, dua tren
va tinh » may tinh
cuu tre » cau tren, cau treo
hieu de » hieu ve, hieu he, hieu le
xay hoi » xa hoi, tay hoi, cay phoi
co luc » coc luc, co luy
luc va » duc va, tuc va, loc va
sac ky » cac ky, sai ky
de co » ke co

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) OR (sac ky)) nang xay hoi. hieu de co luc va tinh vai ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so ((sach ky) OR (sac ky)) nang xay hoi. hieu de co luc va tinh vai ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "so ((sach ky) OR (sac ky)) nang xay hoi. hieu de co luc va tinh vai ((cua tre) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: so ((sach ky) OR (sac ky)) nang xay hoi. hieu de co luc va tinh vai ((cua tre) or (cuu tre))*.