Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
toc sach » hoc sach, doc sach, thuoc sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
hieu va » lieu va, hieu qua
dan sai » danh sai, doan sai, dan tai
sai cua » dai cua, hai cua, lai cua
xac va » tac va, ac va, bac 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 ty nang x hoi. hieu va cac ((xac va) or (duc va)) dan sai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ty nang x hoi. hieu va cac ((xac va) OR (duc va)) dan sai cua triet*.