Perhaps you should try some spelling variations:
chat soc » cham soc, chat hoc, chat doc
su triet » su tien, ve triet
sach ky » sac ky, sach y, sach kem
danh va » doanh va, hanh va, anh va
va danh » va dinh, va dan, va hanh
va chat » van chat, va phat, cao chat
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
sach ty » sach y, sach tu, sach thu
su viet » so viet
soc va » hoc va, loc va, doc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach ky) or (sach ty)) nang xa hoi. hieu va chat soc va danh va ((su triet) OR (su viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sach ty)) nang xa hoi. hieu va chat soc va danh va ((su triet) OR (su viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) or (sach ty)) nang xa hoi. hieu va chat soc va danh va ((su triet) OR (su viet))".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sach ty)) nang xa hoi. hieu va chat soc va danh va ((su triet) OR (su viet))*.