Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
nam thuc » nam thuoc, am thuc, nam thu
cau treo » cau theo, cau triet, cau trieu
dao vai » dao van, dao bai, dao hai
thuc va » thuc vat, thuc dan, thuc day
toc sac » toc sach, toc san, hoc sach
hieu va » lieu va, hieu qua
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
va nam » van nam, ha nam, va nay
sac ky » cac ky, sai ky
dao va » dao van, tao va, do va

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 dang xa hoi. hieu va nam thuc va ((dao vai) or (dao va)) ((cau treo) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sac ky dang xa hoi. hieu va nam thuc va ((dao vai) OR (dao va)) ((cau treo) OR (cau tren)).
• Adding a wildcard symbol may retrieve word variants: toc sac ky dang xa hoi. hieu va nam thuc va ((dao vai) or (dao va)) ((cau treo) or (cau tren))*.