Perhaps you should try some spelling variations:
thien thanh » tien thanh, thi thanh, hien hanh
chieu thien » chieu chien, hieu hien
thanh luc » thanh luu, than luc, nhan luc
hanh va » hanh vi
tu sach » thu sach, te sach, tu cach
tu nang » tru nang, tu nong, tu nano
su sach » so sach, vu sach
huu tre » huu tri, cuu tre, huu them
luc va » duc va, tuc va, loc 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: ((tu sach) or (su sach)) tu nang x hoi. chieu thien thanh luc va ((hanh va) OR (hang va)) huu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) tu nang x hoi. chieu thien thanh luc va ((hanh va) OR (hang va)) huu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (su sach)) tu nang x hoi. chieu thien thanh luc va ((hanh va) OR (hang va)) huu tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) tu nang x hoi. chieu thien thanh luc va ((hanh va) OR (hang va)) huu tre*.