Perhaps you should try some spelling variations:
sach tham » sach nha
tham hanh » pham hanh, tham canh, tham manh
cua triet » cua viet, su triet, va triet
doc sach » hoc sach, toc sach, nuoc sach
khanh vi » hanh vi, khanh v, nhanh vi
xa khanh » xa thanh, van khanh, dat khanh
cac toc » cac toi, cac nuoc, cac thoi
cac tuc » cac tu, cac tac, cac nuoc
hanh ma » hanh mau, hanh may, hanh va
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc sach tham hanh ma hoi. hieu qua ((cac tuc) or (cac toc)) xa khanh vi ((cua triet) or (cua vat))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc sach tham hanh ma hoi. hieu qua ((cac tuc) OR (cac toc)) xa khanh vi ((cua triet) OR (cua vat)).
• Adding a wildcard symbol may retrieve word variants: doc sach tham hanh ma hoi. hieu qua ((cac tuc) or (cac toc)) xa khanh vi ((cua triet) or (cua vat))*.