Perhaps you should try some spelling variations:
xay thanh » day thanh, giay thanh, ngay thanh
cau tren » cu tren, dau tren, ca tren
sach thu » sach thue, sach thieu, sach tham
thuc xay » thuc day, tuc xay, thuat xay
nam thuc » nam thuoc, am thuc, nam thu
san cau » van cau, ban cau, can cau
hieu he » hieu ve, hiem he, hieu le
sach ty » sach y, sach tu, xach tay
hang xa » hoang xa, hang ca, lang xa
he nam » ha nam, nghe nam

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sach ty) or (sach thu)) ((hang xa) or (hang va)) hoi. hieu he nam thuc xay thanh san cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ty) OR (sach thu)) ((hang xa) OR (hang va)) hoi. hieu he nam thuc xay thanh san cau tren.
• Adding a wildcard symbol may retrieve word variants: su ((sach ty) or (sach thu)) ((hang xa) or (hang va)) hoi. hieu he nam thuc xay thanh san cau tren*.