Perhaps you should try some spelling variations:
khanh vai » khanh van, hanh vi, hanh va
dat khanh » van khanh, duy khanh
toc sach » hoc sach, doc sach, thuoc sach
sach bai » sach dao, cac bai, sach xa
bai hanh » ban hanh, bao hanh, ban thanh
cua viet » ca viet, hoa viet, cua dieu
hanh xa » hanh va, hanh ma, hanh xu
hieu va » lieu va, hieu qua
cac tuc » cac tu, cac tac, cac nuoc
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: toc sach bai hanh xa hoi. hieu va ((cac tuc) or (cac toc)) dat khanh vai ((cua viet) or (cua vat))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach bai hanh xa hoi. hieu va ((cac tuc) OR (cac toc)) dat khanh vai ((cua viet) OR (cua vat)).
• Adding a wildcard symbol may retrieve word variants: toc sach bai hanh xa hoi. hieu va ((cac tuc) or (cac toc)) dat khanh vai ((cua viet) or (cua vat))*.