Perhaps you should try some spelling variations:
thuc dan » thuc hanh, hoc dan
su triet » su viet, su tien, ve triet
te sach » toc sach
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
anh va » hanh va
x hoi » xa hoi, o hoi, x ho
va am » va lam, va cam

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: te sach ky nang x hoi. hieu va am ((thuc vat) OR (thuc dan)) anh va su triet~.
• Adding a wildcard symbol may retrieve word variants: te sach ky nang x hoi. hieu va am ((thuc vat) or (thuc dan)) anh va su triet*.