Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
nam thuc » nam thuoc, am thuc, nam thu
thuc xay » thuc day, tuc xay, thuat xay
xay hanh » day nhanh, day thanh, xanh hanh
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
ky sang » ky nang, ky dang, ky tang
hanh va » hang va, hanh vi
ma hoi » mai hoi, ma hoa, me hoi
va cua » va chua, via cua, ca 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: su sach ky sang ((ma hoi) or (xa hoi)). hieu van nam thuc xay hanh va cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky sang ((ma hoi) OR (xa hoi)). hieu van nam thuc xay hanh va cua te.
• Adding a wildcard symbol may retrieve word variants: su sach ky sang ((ma hoi) or (xa hoi)). hieu van nam thuc xay hanh va cua te*.