Perhaps you should try some spelling variations:
cau treo » cau theo, cau tren, cau triet
thuc van » thuc vat, thuc dan, thuc va
dan thuc » dan toc, am thuc
ty nang » ky nang, ty hang, ly nang
hanh di » hanh vi, hanh de, danh di
hang di » hang doi, hang vi, hang dien
su sach » so sach, vu sach
va dan » ca dan, va dao, va dau
x hoi » xa hoi, o hoi, x ho

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