Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu van » thien van, lieu va, hieu ve
hanh dao » lanh dao, thanh dat, thanh dam
hieu va » lieu va, hieu qua
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
dao cua » dai cua, day cua, dan cua
tu sach » thu sach, su sach, te sach
soc va » hoc va, loc va, doc va
luc va » duc va, tuc va, loc 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) OR (hieu va)) chat ((soc va) or (luc va)) hanh dao cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. ((hieu van) OR (hieu va)) chat ((soc va) OR (luc va)) hanh dao cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang xa hoi. ((hieu van) OR (hieu va)) chat ((soc va) or (luc va)) hanh dao cua triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. ((hieu van) OR (hieu va)) chat ((soc va) or (luc va)) hanh dao cua triet*.