Perhaps you should try some spelling variations:
sach thue » sach thu, sach thieu, sach tham
thue nang » thien nang, thuat nang, thi nang
van khang » van khanh, van thanh, van quang
cua triet » cua viet, va triet
cam thuc » am thuc, nam thuc, cam thu
thuc van » thuc vat, thuc dan, thuc va
khang vi » khang voi, hang vi, hang va
su triet » su viet, su tien, ve triet
so sach » so sanh, bo sach, co sach
hieu ve » hieu va, hieu van
ve cam » ve cham, ve cac, va cam
x hoi » xa hoi, o hoi, x ho

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

• If you are trying to use Boolean operators, they must be ALL CAPS: so sach thue nang x hoi. hieu ve cam thuc van khang vi ((cua triet) OR (su triet))~.
• Adding a wildcard symbol may retrieve word variants: so sach thue nang x hoi. hieu ve cam thuc van khang vi ((cua triet) or (su triet))*.