Perhaps you should try some spelling variations:
lam duoc » nam duoc, luat duoc, lam thuoc
dang xay » dang van, van xay
hieu van » hieu va, thien van, lieu va
duoc ma » duoc lam
hai cua » thai cua, dai cua, hoi cua
vai cua » dai cua, lai cua, bai cua
ma hanh » va hanh, da hanh, na hanh
van lam » van nam
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky nang, ky danh
sac ky » cac ky, sai ky
vi cua » di cua
so sac » so sach, so dac

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sac ky dang xay hoi. hieu van lam duoc ma hanh ((vi cua) or (((vai cua) or (hai cua)))) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sac ky dang xay hoi. hieu van lam duoc ma hanh ((vi cua) OR (((vai cua) OR (hai cua)))) tre.
• Adding a wildcard symbol may retrieve word variants: so sac ky dang xay hoi. hieu van lam duoc ma hanh ((vi cua) or (((vai cua) or (hai cua)))) tre*.