Perhaps you should try some spelling variations:
dang xay » dang van, van xay
cau thuc » cau truc, cuu thuc, can thuc
thuc dan » thuc hanh, hoc dan, thuc vat
dan hanh » dang hanh, dan khanh, dan thanh
tu sach » thu sach, su sach, te sach
lang ha » long ha
hieu va » lieu va, hieu qua
hanh le » thanh le, hanh ve, hanh de
va cau » van cau, va cac, va dau
le cua » ly cua
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach y ((lang ha) or (dang xay)) hoi. hieu va cau thuc dan hanh le cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y ((lang ha) OR (dang xay)) hoi. hieu va cau thuc dan hanh le cua te.
• Adding a wildcard symbol may retrieve word variants: tu sach y ((lang ha) or (dang xay)) hoi. hieu va cau thuc dan hanh le cua te*.