Perhaps you should try some spelling variations:
hoc sach » hoc cac, hoc anh
nam thuc » nam thuoc, am thuc, nam thu
nang xa » nang x, lang xa, nang ma
hieu va » lieu va
thuc ca » thuc cua, thuc can, thuc cao
dan vai » dan va, dan tai, dan vat
vai cuu » vai cua
cuu tre » cua tre, cau tren, cau treo
ca dan » cac dan, ca dao

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc sach) or (hoc sinh)) ky nang xa hoi. ((hieu va) or (hieu qua)) nam thuc ca dan vai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc sach) OR (hoc sinh)) ky nang xa hoi. ((hieu va) OR (hieu qua)) nam thuc ca dan vai cuu tre.
• Adding a wildcard symbol may retrieve word variants: ((hoc sach) or (hoc sinh)) ky nang xa hoi. ((hieu va) or (hieu qua)) nam thuc ca dan vai cuu tre*.