Perhaps you should try some spelling variations:
cau treo » cau theo, cau tren, cau triet
thuc dan » thuc hanh, hoc dan
vai cau » va cau, van cau, vai cac
dan vai » dan va, dan tai, dan vat
toc sac » toc sach, toc san, hoc sach
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
ky lang » ky nang, ky dang, ky tang
thuc va » thuc day
sac ky » cac ky, sai ky
va nam » van nam, ha nam, va nay

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sac ky lang xa hoi. hieu va nam ((((thuc va) OR (thuc vat))) or (thuc dan)) dan vai cau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sac ky lang xa hoi. hieu va nam ((((thuc va) OR (thuc vat))) OR (thuc dan)) dan vai cau treo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sac ky lang xa hoi. hieu va nam ((((thuc va) OR (thuc vat))) or (thuc dan)) dan vai cau treo".
• Adding a wildcard symbol may retrieve word variants: toc sac ky lang xa hoi. hieu va nam ((((thuc va) OR (thuc vat))) or (thuc dan)) dan vai cau treo*.