Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
danh kien » dinh kien, danh viet, linh kien
cua triet » cua viet, su triet, va triet
doc sach » hoc sach, toc sach, nuoc sach
thuc day » thuc dan, thuc vat
day danh » day manh, dai danh, dao danh
kien cua » khien cua, dien cua, tien cua
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu va » hieu qua

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

• If you are trying to use Boolean operators, they must be ALL CAPS: doc sach ky nang xa hoi. ((hieu va) OR (lieu va)) tham thuc day danh kien cua triet~.
• Adding a wildcard symbol may retrieve word variants: doc sach ky nang xa hoi. ((hieu va) or (lieu va)) tham thuc day danh kien cua triet*.