Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
hieu van » hieu va, thien van, lieu va
van chat » cao chat
hanh dai » hanh tai, hanh dao, vanh dai
han tai » hang tai, nhan tai, van tai
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
sach ky » sac ky, sach y, sach ty
loc va » hoc va, luc va
soc va » hoc va, doc va, goc 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 nang xa hoi. hieu van chat ((soc va) or (loc va)) ((hanh dai) or (han tai)) su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. hieu van chat ((soc va) OR (loc va)) ((hanh dai) OR (han tai)) su triet.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. hieu van chat ((soc va) or (loc va)) ((hanh dai) or (han tai)) su triet*.