Perhaps you should try some spelling variations:
dang xay » dang van, van xay
cam thuc » am thuc, cam thu, can thuc
nam thuc » nam thuoc, am thuc, nam thu
hanh doi » thanh doi, hanh noi, hang doi
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
ky dang » ky nang, ky danh
xay hoi » xa hoi, tay hoi, cay phoi
hieu ve » hieu va, hieu van
va hanh » van hanh, va thanh, ban hanh
doi cua » dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky dang xay hoi. hieu ve ((cam thuc) OR (nam thuc)) va hanh doi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky dang xay hoi. hieu ve ((cam thuc) OR (nam thuc)) va hanh doi cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ky dang xay hoi. hieu ve ((cam thuc) OR (nam thuc)) va hanh doi cua tre*.