Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
toc sach » hoc sach, doc sach, thuoc sach
hieu va » lieu va, hieu qua
va cham » va chat, va tham
y nang » ky nang, ly nang, v nang
xac va » tac va, ac va, bac va
dan vi » doan vi, don vi, gan vi
dan va » doan va, dan ca, ban va
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: toc sach y nang x hoi. hieu va cham ((xac va) or (duc va)) ((dan vi) OR (dan va)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y nang x hoi. hieu va cham ((xac va) OR (duc va)) ((dan vi) OR (dan va)) cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach y nang x hoi. hieu va cham ((xac va) or (duc va)) ((dan vi) OR (dan va)) cua triet".
• Adding a wildcard symbol may retrieve word variants: toc sach y nang x hoi. hieu va cham ((xac va) or (duc va)) ((dan vi) OR (dan va)) cua triet*.