Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
dang thai » dang thi, dang hai, dang khai
thu sach » tu sach, thuat sach, thuoc sach
cac nuoc » cap nuoc, hoc nuoc, cua nuoc
san dang » van dang, san sang, ban dang
thai cua » than cua, tai cuc, tri cua
sach ky » sac ky, sach y, sach ty
thi van » thi lan, thi hanh, thi nang
x hoi » xa hoi, o hoi, 5 hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky nang ((x hoi) OR (x ho)). thi van ((cac nuoc) or (dat nuoc)) san dang thai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang ((x hoi) OR (x ho)). thi van ((cac nuoc) OR (dat nuoc)) san dang thai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang ((x hoi) OR (x ho)). thi van ((cac nuoc) or (dat nuoc)) san dang thai cua triet".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang ((x hoi) OR (x ho)). thi van ((cac nuoc) or (dat nuoc)) san dang thai cua triet*.