Perhaps you should try some spelling variations:
dan khanh » dang khanh, van khanh, dat khanh
dang xay » dang van, van xay
cau thuc » cau truc, cuu thuc, can thuc
thuc dan » thuc hanh, hoc dan, thuc vat
khanh ve » hanh ve, thanh ve, khanh v
tu sach » thu sach, su sach, te sach
xay hoi » xa hoi, tay hoi, cay phoi
hieu va » lieu va, hieu qua
y dang » ky dang, 2 dang, _ dang
va cau » van cau, va cac, va dau
cua tu » cua tuc, cua su, cua cu

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 y dang xay hoi. hieu va cau thuc dan khanh ve ((cua te) or (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y dang xay hoi. hieu va cau thuc dan khanh ve ((cua te) OR (cua tu)).
• Adding a wildcard symbol may retrieve word variants: tu sach y dang xay hoi. hieu va cau thuc dan khanh ve ((cua te) or (cua tu))*.