Perhaps you should try some spelling variations:
thanh vi » hanh vi, thanh va, thanh ve
cau treo » cau theo, cau tren, cau triet
va thanh » gia thanh, ban thanh, va tinh
doc thuc » hoc thuc, do thuc, hoc thuoc
tu sach » thu sach, su sach, te sach
thuc va » thuc vat, thuc dan, thuc day
va nang » van nang, da nang, cam nang
hieu ve » hieu va, hieu van
ve doc » ve duoc, va doc, me doc
v nang » vu nang, van nang, voi nang
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: tu sach ((v nang) OR (va nang)) x hoi. hieu ve doc thuc va thanh vi ((cau treo) or (cau thi))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((v nang) OR (va nang)) x hoi. hieu ve doc thuc va thanh vi ((cau treo) OR (cau thi)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((v nang) OR (va nang)) x hoi. hieu ve doc thuc va thanh vi ((cau treo) or (cau thi))".
• Adding a wildcard symbol may retrieve word variants: tu sach ((v nang) OR (va nang)) x hoi. hieu ve doc thuc va thanh vi ((cau treo) or (cau thi))*.