Perhaps you should try some spelling variations:
khanh van » thanh van, khanh vinh, hanh va
khanh vai » hanh vi, hanh va, thanh van
hoc sach » hoc sinh, hoc cac, hoc anh
sach thi » sach thu, sach tai, sach thieu
su triet » su viet, su tien, ve triet
thi hanh » thi thanh
cac tuc » cac tu, cac tac, cac nuoc
hieu va » lieu va, hieu qua
hanh xa » hanh va, hanh ma, hanh xu
cac toc » cac toi, cac nuoc, cac thoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach thi hanh xa hoi. hieu va ((cac tuc) or (cac toc)) xa ((khanh vai) OR (khanh van)) su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach thi hanh xa hoi. hieu va ((cac tuc) OR (cac toc)) xa ((khanh vai) OR (khanh van)) su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach thi hanh xa hoi. hieu va ((cac tuc) or (cac toc)) xa ((khanh vai) OR (khanh van)) su triet".
• Adding a wildcard symbol may retrieve word variants: hoc sach thi hanh xa hoi. hieu va ((cac tuc) or (cac toc)) xa ((khanh vai) OR (khanh van)) su triet*.