Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
toc sach » hoc sach, doc sach, nuoc sach
nam thuc » nam thuoc, am thuc, nam thu
cau treo » cau theo, cau tren, cau triet
nang xa » nang x, lang xa, nang ma
hieu ca » hieu cac, hieu cua, hieu va
thuc va » thuc vat, thuc dan, thuc day
dan vat » dang vat, van vat, dan va
cuu tre » cua tre, cau tren
ca nam » cua nam, cai nam, ha nam
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: ((toc sach) OR (thuoc sach)) ky nang xa hoi. hieu ca nam thuc va dan vat ((cuu tre) or (cau treo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (thuoc sach)) ky nang xa hoi. hieu ca nam thuc va dan vat ((cuu tre) OR (cau treo)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (thuoc sach)) ky nang xa hoi. hieu ca nam thuc va dan vat ((cuu tre) or (cau treo))".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) OR (thuoc sach)) ky nang xa hoi. hieu ca nam thuc va dan vat ((cuu tre) or (cau treo))*.