Perhaps you should try some spelling variations:
hieu quan » hieu qua, lieu quan, thien quan
cua triet » cua viet, su triet, va triet
thu sach » tu sach, thuat sach, thuoc sach
quan cua » quan luan, ban cua, gian cua
sach ky » sac ky, sach y, sach ty
nang ro » nang co, nang ho, nang ra
hanh ve » hanh vi, hanh va, hanh kem
ro hoi » co hoi, o hoi, mo hoi
xuc va » tuc va, luc va, xac va
cua te » cua tu

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 ro hoi. hieu quan cua ((xuc va) or (duc va)) hanh ve ((cua te) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang ro hoi. hieu quan cua ((xuc va) OR (duc va)) hanh ve ((cua te) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang ro hoi. hieu quan cua ((xuc va) or (duc va)) hanh ve ((cua te) or (cua triet))*.