Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
anh thuc » am thuc, dan thuc, anh tu
vien anh » vien canh, viet anh, dien anh
va tinh » may tinh
thuc va » thuc vat, thuc dan, thuc day
tu sach » thu sach, su sach, te sach
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky danh
va cuu » va cau, va chu
va huu » vu 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 va tinh ((va cuu) OR (va huu)) 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 va tinh ((va cuu) OR (va huu)) 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 va tinh ((va cuu) OR (va huu)) tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ky dang) or (ky nang)) xay hoi. hieu vien anh thuc va tinh ((va cuu) OR (va huu)) tre*.