Perhaps you should try some spelling variations:
sang mai » sang ma, sang tai, lang mai
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
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
ky sang » ky nang, ky dang, ky tang
mai hoi » mai khoi, dai hoi, lai hoi
vai cua » hai cua, lai cua, bai cua

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 ky sang mai hoi. hieu van nam thuc xay hanh ((vai cua) or (dai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky sang mai hoi. hieu van nam thuc xay hanh ((vai cua) OR (dai cua)) tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky sang mai hoi. hieu van nam thuc xay hanh ((vai cua) or (dai cua)) tre*.