Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
te sach » toc sach
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
ve tham » va tham, ve cham, vi tham
thuc va » thuc vat, thuc dan, thuc day
va danh » va dinh, va dan, va hanh
danh di » danh du, xanh di, danh dien
ca viet » va viet, co viet, hoa viet
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang

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 v nang xa hoi. hieu ve tham thuc va danh di ((cua vat) OR (ca viet))~.
• Adding a wildcard symbol may retrieve word variants: te sach v nang xa hoi. hieu ve tham thuc va danh di ((cua vat) or (ca viet))*.