Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
quang hoi » quang huy, quan doi
quang tri » quan tri
hieu van » thien van, lieu va, hieu ve
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
cua te » cua tu
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: thuat sach ky nang x hoi. ((hieu van) or (hieu va)) cac nuoc va ((quang hoi) OR (quang tri)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ky nang x hoi. ((hieu van) OR (hieu va)) cac nuoc va ((quang hoi) OR (quang tri)) cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ky nang x hoi. ((hieu van) or (hieu va)) cac nuoc va ((quang hoi) OR (quang tri)) cua te".
• Adding a wildcard symbol may retrieve word variants: thuat sach ky nang x hoi. ((hieu van) or (hieu va)) cac nuoc va ((quang hoi) OR (quang tri)) cua te*.