Perhaps you should try some spelling variations:
khoa hoi » khoan hoi, khoa hoc, khoa doi
nam thuc » nam thuoc, am thuc, nam thu
va hanh » van hanh, va thanh, va danh
ky lang » ky nang, ky dang, ky tang
hoa hoi » hoa hoc, hoa doi, hoc hoi
hieu ve » hieu va, hieu van
thuc va » thuc vat, thuc dan, thuc day
vai su » van su, lai su, tai su
tu sac » tu sach, tu cac, tu 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: tu sac ky lang ((hoa hoi) or (khoa hoi)). hieu ve nam thuc va hanh ((vai su) or (va su)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky lang ((hoa hoi) OR (khoa hoi)). hieu ve nam thuc va hanh ((vai su) OR (va su)) triet.
• Adding a wildcard symbol may retrieve word variants: tu sac ky lang ((hoa hoi) or (khoa hoi)). hieu ve nam thuc va hanh ((vai su) or (va su)) triet*.