Perhaps you should try some spelling variations:
cach thuc » anh thuc, cac thu
thuc day » thuc dan, thuc vat
day hang » dat hang, dai hang, day nang
hieu van » hieu va, thien van, lieu va
so sach » so sanh, bo sach, co sach
vu sach » vu bach, su sach, vu khach
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va
hang di » hang doi, hang vi, hang dien
di cua » dai cua, doi cua, de 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: ((so sach) or (vu sach)) ky nang xa hoi. ((hieu ve) or (hieu van)) cach thuc day hang di cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (vu sach)) ky nang xa hoi. ((hieu ve) OR (hieu van)) cach thuc day hang di cua te.
• Adding a wildcard symbol may retrieve word variants: ((so sach) or (vu sach)) ky nang xa hoi. ((hieu ve) or (hieu van)) cach thuc day hang di cua te*.