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