Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thu sach » tu sach, thuat sach, thuoc sach
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
sach ky » sac ky, sach y, sach ty
doan vi » doan va, don vi, doan thi
cac tu » cac thu, cach tu, tac tu
dan va » doan va, dan ca, ban va

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 xa hoi. hieu ve ((cac tu) or (cac du)) va ((doan vi) or (dan va)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang xa hoi. hieu ve ((cac tu) OR (cac du)) va ((doan vi) OR (dan va)) cua triet.
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang xa hoi. hieu ve ((cac tu) or (cac du)) va ((doan vi) or (dan va)) cua triet*.