Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thanh vi » hanh vi, thanh va, thanh ve
cong tac » cong ty
va cham » va chat, va tham
luc van » luoc van, luu van, duc van
xuc van » duc van, vuc van, xuc ban
tu sach » thu sach, su sach, tu cach
tac hoi » tao hoi, tay hoi, tac hai
ky cong » ke cong, ly cong, khu cong
te sach » toc sach
hieu va » lieu va, hieu qua
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: ((tu sach) or (te sach)) ky cong tac hoi. hieu va cham ((xuc van) OR (luc van)) thanh vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ky cong tac hoi. hieu va cham ((xuc van) OR (luc van)) thanh vi cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (te sach)) ky cong tac hoi. hieu va cham ((xuc van) OR (luc van)) thanh vi cua triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) ky cong tac hoi. hieu va cham ((xuc van) OR (luc van)) thanh vi cua triet*.