Perhaps you should try some spelling variations:
cua triet » cua viet, va triet
su triet » su viet, su tien, ve triet
van hanh » van thanh, ban hanh, van anh
cam thuc » am thuc, nam thuc, cam thu
sach ly » sach y, sach lo, sach ty
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
ly hang » ly quang
va hanh » va thanh, va danh, ban hanh
ve cam » ve cham, ve cac, va cam
va hoi » xa hoi, va hoc, va hoa

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 ly hang va hoi. hieu ve cam thuc ((va hanh) OR (van hanh)) di ((cua triet) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ly hang va hoi. hieu ve cam thuc ((va hanh) OR (van hanh)) di ((cua triet) OR (su triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ly hang va hoi. hieu ve cam thuc ((va hanh) OR (van hanh)) di ((cua triet) or (su triet))".
• Adding a wildcard symbol may retrieve word variants: tu sach ly hang va hoi. hieu ve cam thuc ((va hanh) OR (van hanh)) di ((cua triet) or (su triet))*.