Perhaps you should try some spelling variations:
cham thuc » nham thuc, pham thuc, tham thuc
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
thuc va » thuc vat, thuc dan, thuc day
va hang » van hang, va nang, va lang
hang di » hang doi, hang vi, hang dien
cua tre » cuu tre, cua triet, dua tren
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: ((su sach) or (vu bach)) ky nang xa hoi. hieu ve cham thuc va hang di ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu bach)) ky nang xa hoi. hieu ve cham thuc va hang di ((cua tre) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu bach)) ky nang xa hoi. hieu ve cham thuc va hang di ((cua tre) or (cua te))*.