Perhaps you should try some spelling variations:
cac thuc » cach thuc, cac thu, can thuc
su triet » su viet, su tien, ve triet
va triet » va trien, ve triet, cua triet
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
hanh di » hanh vi, hanh de, hang di
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang
ve cac » va cac, vien cac
thiet » thieu

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 v nang xa hoi. hieu ve cac thuc va hanh di ((su triet) or (((va triet) or (va thiet))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach v nang xa hoi. hieu ve cac thuc va hanh di ((su triet) OR (((va triet) OR (va thiet)))).
• Adding a wildcard symbol may retrieve word variants: su sach v nang xa hoi. hieu ve cac thuc va hanh di ((su triet) or (((va triet) or (va thiet))))*.