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 ha » hieu hoa, hieu va, hieu ca
thuc va » thuc vat, thuc dan, thuc day
dan tai » van tai, dan thi, han tai
tai cau » tai cac, tai cao
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 ha nam thuc va dan tai 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 ha nam thuc va dan tai cau treo.
• Adding a wildcard symbol may retrieve word variants: ((hoc sach) or (hoc sinh)) ((ky lang) or (ky dang)) xa hoi. hieu ha nam thuc va dan tai cau treo*.