Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van chat » cao chat
cua viet » ca viet, cua vat, cua dieu
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
soc va » hoc va, loc va, goc va
doc va » duoc va, hoc va, duc 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 nang x hoi. hieu van chat ((soc va) OR (doc va)) lanh dao ((cua viet) or (hoa viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang x hoi. hieu van chat ((soc va) OR (doc va)) lanh dao ((cua viet) OR (hoa viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ky nang x hoi. hieu van chat ((soc va) OR (doc va)) lanh dao ((cua viet) or (hoa viet))".
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang x hoi. hieu van chat ((soc va) OR (doc va)) lanh dao ((cua viet) or (hoa viet))*.