Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
dang xay » dang van, van xay
cua tre » cua te, cuu tre, cua triet
tinh va » tich va, trinh van, trinh vat
va tinh » may tinh
thuc va » thuc vat, thuc dan, thuc day
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky nang, ky danh
ve cac » va cac, vien cac
ve cau » ke cau, va cau, le cau

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 ky dang xay hoi. hieu ((ve cau) or (ve cac)) thuc va tinh va ((cua tre) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky dang xay hoi. hieu ((ve cau) OR (ve cac)) thuc va tinh va ((cua tre) OR (cua viet)).
• Adding a wildcard symbol may retrieve word variants: vu sach ky dang xay hoi. hieu ((ve cau) or (ve cac)) thuc va tinh va ((cua tre) or (cua viet))*.