Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu van » thien van, lieu va, hieu ve
duc manh » suc manh, duc anh, duc minh
te sach » toc sach
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
duc van » duc va, duc tan, duc phan
anh va » hanh va
va cua » va chua, via cua, ca cua
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: te sach ky nang x hoi. ((hieu van) or (hieu va)) cao ((duc van) OR (duc manh)) anh va cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang x hoi. ((hieu van) OR (hieu va)) cao ((duc van) OR (duc manh)) anh va cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang x hoi. ((hieu van) or (hieu va)) cao ((duc van) OR (duc manh)) anh va cua triet".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang x hoi. ((hieu van) or (hieu va)) cao ((duc van) OR (duc manh)) anh va cua triet*.