Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
hieu van » hieu va, thien van, lieu va
van chat » cao chat
sach ty » sach y, sach tu, sach thu
sach ky » sac ky, sach y, sach kem
dao cua » dai cua, day cua, dan cua
soc va » hoc va, doc va, goc va
loc va » hoc va, luc va
x hoi » xa hoi, o hoi, x ho

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

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