Perhaps you should try some spelling variations:
nuoc sach » nguoi sach, hoc sach, cuoc cach
phuc van » phuc va, chuc van, khuc van
thuc van » thuc vat, thuc dan, thuc va
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
cuu tre » cau tren, cau treo
cua tre » cua te, cua triet, dua tren
ve cau » ke cau, va cau, ve cac
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: nuoc sach ky nang x hoi. hieu ve cau ((phuc van) or (thuc van)) hanh vi ((cuu tre) OR (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: nuoc sach ky nang x hoi. hieu ve cau ((phuc van) OR (thuc van)) hanh vi ((cuu tre) OR (cua tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "nuoc sach ky nang x hoi. hieu ve cau ((phuc van) or (thuc van)) hanh vi ((cuu tre) OR (cua tre))".
• Adding a wildcard symbol may retrieve word variants: nuoc sach ky nang x hoi. hieu ve cau ((phuc van) or (thuc van)) hanh vi ((cuu tre) OR (cua tre))*.