Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
danh dau » lanh dao, hang dau, danh tu
van chat » cao chat
nang xa » nang x, lang xa, nang ma
dau cua » dai cua, day cua, cau cua
tu sach » thu sach, su sach, te sach
soc va » hoc va, doc va, goc va
loc va » hoc va, luc 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) or (thuoc sach)) ky nang xa hoi. hieu van chat ((soc va) OR (loc va)) danh dau cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thuoc sach)) ky nang xa hoi. hieu van chat ((soc va) OR (loc va)) danh dau cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thuoc sach)) ky nang xa hoi. hieu van chat ((soc va) OR (loc va)) danh dau cua triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thuoc sach)) ky nang xa hoi. hieu van chat ((soc va) OR (loc va)) danh dau cua triet*.