Perhaps you should try some spelling variations:
mai khoi » mai khoa, tai khoa, cac khoi
nam thuc » nam thuoc, am thuc, nam thu
nang du » nang tu, nang luc, nang doc
va nang » van nang, da nang, cam nang
thuc va » thuc vat, thuc dan, thuc day
hieu ve » hieu va, hieu van
te sach » toc sach
mai hoi » dai hoi, lai hoi, mai doi
su sach » so sach, vu sach
ve nam » he nam, va nam, le nam
du cua » duy cua, dau cua, dum cua
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) or (su sach)) ky nang ((mai hoi) OR (mai khoi)). hieu ve nam thuc va nang du cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (su sach)) ky nang ((mai hoi) OR (mai khoi)). hieu ve nam thuc va nang du cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (su sach)) ky nang ((mai hoi) OR (mai khoi)). hieu ve nam thuc va nang du cua te".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (su sach)) ky nang ((mai hoi) OR (mai khoi)). hieu ve nam thuc va nang du cua te*.