Perhaps you should try some spelling variations:
hoc sach » hoc cac, hoc anh
nam thuc » nam thuoc, am thuc, nam thu
cau treo » cau theo, cau tren, cau triet
ky lang » ky nang, ky tang, tay lang
ky dang » ky nang, ky danh
hieu ca » hieu cac, hieu cua, hieu va
thuc va » thuc vat, thuc dan, thuc day
dan vai » dan va, dan tai, dan vat
vai cau » va cau, van cau, vai cac
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: ((hoc sach) or (hoc sinh)) ((ky lang) or (ky dang)) xa hoi. hieu ca nam thuc va dan vai cau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc sach) OR (hoc sinh)) ((ky lang) OR (ky dang)) xa hoi. hieu ca nam thuc va dan vai cau treo.
• Adding a wildcard symbol may retrieve word variants: ((hoc sach) or (hoc sinh)) ((ky lang) or (ky dang)) xa hoi. hieu ca nam thuc va dan vai cau treo*.