Perhaps you should try some spelling variations:
hieu quan » lieu quan, thien quan, lien quan
thanh tai » thanh hai, thanh toan, doanh tai
cua triet » cua viet, su triet, va triet
va thanh » gia thanh, ban thanh, va tinh
tu sach » thu sach, su sach, tu cach
te sach » toc sach
cac duc » cac du, cao duc, cac dac
tai cua » thai cua, tai cuc, tri cua
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: ((tu sach) or (te sach)) ky nang x hoi. ((hieu quan) or (hieu qua)) cac duc va thanh tai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ky nang x hoi. ((hieu quan) OR (hieu qua)) cac duc va thanh tai cua triet.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) ky nang x hoi. ((hieu quan) or (hieu qua)) cac duc va thanh tai cua triet*.