Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
cau treo » cau theo, cau triet, cau trieu
cau tren » cu tren, dau tren, ca tren
ky lang » ky dang, ky tang, tay lang
hieu ha » hieu hoa, hieu va, hieu ca
thuc va » thuc vat, thuc dan, thuc day
dan vai » dan va, dan tai, dan vat
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 sinh ((ky lang) OR (ky nang)) xa hoi. hieu ha nam thuc va dan vai ((cau treo) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sinh ((ky lang) OR (ky nang)) xa hoi. hieu ha nam thuc va dan vai ((cau treo) OR (cau tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sinh ((ky lang) OR (ky nang)) xa hoi. hieu ha nam thuc va dan vai ((cau treo) or (cau tren))".
• Adding a wildcard symbol may retrieve word variants: hoc sinh ((ky lang) OR (ky nang)) xa hoi. hieu ha nam thuc va dan vai ((cau treo) or (cau tren))*.