Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
van thanh » ban thanh, van tuan
van doanh » toan doanh, van dong, van anh
hieu ve » hieu va, hieu van
sach ky » sach y, sach ty, sach kem
nang o » nang co, nang ho, nang ro
sac ky » cac ky, sai ky
va cua » va chua, via cua, ca cua
ve am » va am
o hoi » co hoi, o hoc, o hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach ky) or (sac ky)) nang o hoi. hieu ve am thuc ((van doanh) OR (van thanh)) va cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sac ky)) nang o hoi. hieu ve am thuc ((van doanh) OR (van thanh)) va cua triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) or (sac ky)) nang o hoi. hieu ve am thuc ((van doanh) OR (van thanh)) va cua triet*".