Perhaps you should try some spelling variations:
lam duoc » luat duoc, lam thuoc, tao duoc
dang xay » dang van, van xay
hanh san » thanh san, khach san, thanh son
ban hanh » ban hang
nam duoc » nam thuoc, da duoc, dat duoc
hieu van » hieu va, thien van, lieu va
cua tre » cua te, cuu tre, cua triet
san cua » sang cua, ban cua, dan cua
lang ha » long ha
sac ky » cac ky, sai ky
su sac » su sach, su cac, su xac

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

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