Perhaps you should try some spelling variations:
van dinh » van minh, van dich, va dinh
pham duy » pham duc
duy van » duy vat, dung van
tu sach » thu sach, su sach, tu cach
hieu ve » hieu va, hieu van
te sach » toc sach
ve pham » vi pham, v pham, ve phan
y nang » ky nang, ly nang, v nang
x hoi » xa hoi, o hoi, x ho
su va » su van

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 (te sach)) y nang x hoi. hieu ve pham duy van dinh ((su va) OR (tu va)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) y nang x hoi. hieu ve pham duy van dinh ((su va) OR (tu va)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (te sach)) y nang x hoi. hieu ve pham duy van dinh ((su va) OR (tu va)) triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) y nang x hoi. hieu ve pham duy van dinh ((su va) OR (tu va)) triet*.