Perhaps you should try some spelling variations:
thuc dan » thuc hanh, hoc dan, thuc vat
so sach » so sanh, bo sach, hoc sach
co sach » bo sach, cuon sach, hoc sach
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
thuc va » thuc vat, thuc day
vi cua » vai cua, di cua
cua te » cua tu
va am » va lam, va cam

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 (co sach)) ky nang xa hoi. hieu va am ((thuc va) or (thuc dan)) hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (co sach)) ky nang xa hoi. hieu va am ((thuc va) OR (thuc dan)) hanh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) OR (co sach)) ky nang xa hoi. hieu va am ((thuc va) or (thuc dan)) hanh vi cua te".
• Adding a wildcard symbol may retrieve word variants: ((so sach) OR (co sach)) ky nang xa hoi. hieu va am ((thuc va) or (thuc dan)) hanh vi cua te*.