Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
anh thuc » dan thuc, anh tu, anh duc
tu sach » thu sach, su sach, te sach
ky dang » ky danh
xay hoi » xa hoi, tay hoi, cay phoi
va tinh » may tinh
tinh va » tich va, trinh van, trinh vat
cuu tre » cua tre, cau tren, cau treo
va cuu » va cau, va chu, va huu

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