Perhaps you should try some spelling variations:
cau treo » cau theo, cau tren, cau triet
thuc van » thuc vat, thuc dan, thuc hanh
thuc va » thuc vat, thuc dan, thuc day
hang di » hang doi, hang vi, hang dien
hanh di » hanh vi, hanh de, danh di
so sach » so sanh, bo sach, co sach
sach ty » sach y, sach tu, sach thu
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
va dan » ca dan, va dao, va dau

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 ty nang xa hoi. lieu va dan ((thuc van) OR (thuc va)) ((hanh di) or (hang di)) cau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ty nang xa hoi. lieu va dan ((thuc van) OR (thuc va)) ((hanh di) OR (hang di)) cau treo*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ty nang xa hoi. lieu va dan ((thuc van) OR (thuc va)) ((hanh di) or (hang di)) cau treo*".