Perhaps you should try some spelling variations:
hanh kien » danh kien, anh kien, thanh vien
sach dato » sach dao, sach danh, sach dau
su triet » su viet, su tien, ve triet
nam thuc » nam thuoc, am thuc, nam thu
sach dat » sach dao, sach danh, sach bai
cam thuc » am thuc, cam thu, can thuc
kien su » nien su, tien su, vien sau
va hanh » van hanh, va thanh, va danh
hieu ve » hieu va, hieu van
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sach dat) or (sach dato)) nang x hoi. hieu ve ((cam thuc) or (nam thuc)) va hanh kien su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach dat) OR (sach dato)) nang x hoi. hieu ve ((cam thuc) OR (nam thuc)) va hanh kien su triet.
• Adding a wildcard symbol may retrieve word variants: su ((sach dat) or (sach dato)) nang x hoi. hieu ve ((cam thuc) or (nam thuc)) va hanh kien su triet*.