Perhaps you should try some spelling variations:
dang xay » dang van, van xay
cuu thuc » cuu tac
thuc dan » thuc hanh, hoc dan, thuc vat
dan hanh » dang hanh, dan khanh, dan thanh
xay hoi » xa hoi, tay hoi, cay phoi
hieu va » lieu va, hieu qua
hanh ve » hanh vi, hanh va, hanh kem
sach o » sach lo, sac o, mach o
va cuu » va cau, va chu, va huu
ve cua » le cua, de cua, te 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 o) or (sach y)) dang xay hoi. hieu va cuu thuc dan hanh ve cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach o) OR (sach y)) dang xay hoi. hieu va cuu thuc dan hanh ve cua te.
• Adding a wildcard symbol may retrieve word variants: tu ((sach o) or (sach y)) dang xay hoi. hieu va cuu thuc dan hanh ve cua te*.