Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
truoc va » truc va, truong va, truoc bua
thuoc va » thuc va, thuoc ma, thuong va
vu sach » vu bach, vu khach
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
su sach » so sach
y nang » ky nang, ly nang, v nang
va lam » van lam, va lap
dan vi » doan vi, don vi, dan va
vi cua » vai cua, di cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (vu sach)) y nang xa hoi. hieu va lam ((truoc va) OR (thuoc va)) dan vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) y nang xa hoi. hieu va lam ((truoc va) OR (thuoc va)) dan vi cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (vu sach)) y nang xa hoi. hieu va lam ((truoc va) OR (thuoc va)) dan vi cua triet".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu sach)) y nang xa hoi. hieu va lam ((truoc va) OR (thuoc va)) dan vi cua triet*.