Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
nam thuc » nam thuoc, am thuc, nam thu
va hanh » van hanh, va thanh, va danh
ky tang » ky nang, ky dang, kho tang
hoa hoi » khoa hoi, hoa hoc, hoc hoi
hai cua » thai cua, dai cua, hoi cua
hoa doi » hoa dai, hoc doi, xoa doi
hieu ve » hieu va, hieu van
va dan » ca dan, va dao, va dau
te sac » te sach, te cac, te san
sac ky » cac ky, sai ky
ve nam » he nam, va nam, le nam

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sac ky tang ((hoa hoi) or (hoa doi)). hieu ve nam thuc ((va hanh) or (va dan)) hai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky tang ((hoa hoi) OR (hoa doi)). hieu ve nam thuc ((va hanh) OR (va dan)) hai cua triet.
• Adding a wildcard symbol may retrieve word variants: te sac ky tang ((hoa hoi) or (hoa doi)). hieu ve nam thuc ((va hanh) or (va dan)) hai cua triet*.