Perhaps you should try some spelling variations:
nganh xay » nganh mac, nganh y, nganh ma
thanh von » thanh van, thanh son, thanh vo
dang xay » dang van, van xay
su sach » so sach, vu sach
von luu » von luan
va chao » va cao, va chat, va cham
hieu va » lieu va, hieu qua
sach ky » sac ky, sach y, sach ty
luu tre » luu tru, cuu tre, luy tre
xu gia » xu giao
vu gia » vu giao, vu giam, va gia

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 ((nganh xay) or (dang xay)) hoi. hieu va chao ((xu gia) or (vu gia)) thanh von luu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((nganh xay) OR (dang xay)) hoi. hieu va chao ((xu gia) OR (vu gia)) thanh von luu tre.
• Adding a wildcard symbol may retrieve word variants: su sach ky ((nganh xay) or (dang xay)) hoi. hieu va chao ((xu gia) or (vu gia)) thanh von luu tre*.