Perhaps you should try some spelling variations:
thuc dang » thuoc dang, thuc dan, thuc dung
dang hanh » dang thanh, ban hanh, dang van
cua triet » su triet, va triet
cua viet » ca viet, hoa viet, cua vat
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu ca » hieu cac, hieu cua, hieu va

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 nang xa hoi. ((hieu ca) or (lieu va)) am thuc dang hanh vi ((cua triet) OR (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang xa hoi. ((hieu ca) OR (lieu va)) am thuc dang hanh vi ((cua triet) OR (cua viet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang xa hoi. ((hieu ca) or (lieu va)) am thuc dang hanh vi ((cua triet) OR (cua viet))*".