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

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 tu))) or (cac toc)) xa khanh vai 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 tu))) OR (cac toc)) xa khanh vai 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 tu))) or (cac toc)) xa khanh vai su triet".
• Adding a wildcard symbol may retrieve word variants: hoc sach thi hanh xa hoi. hieu va ((((cac tuc) OR (cac tu))) or (cac toc)) xa khanh vai su triet*.