Perhaps you should try some spelling variations:
nha thuoc » nha nuoc, nhan thuc, nha hoc
thanh tai » thanh hai, thanh toan, doanh tai
nam thuc » nam thuoc, am thuc, nam thu
va thanh » gia thanh, ban thanh, va tinh
te sach » toc sach
hieu le » hieu ve, hieu he, hieu ly
hoc doi » hoc dai, hoc noi, hoc moi
ty hang » ly hang, thi hang, thu hang
tai va » thai va, mai va, tri va
thiet » thieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ((ty hang) or (ty xang)) hoc doi. hieu le ((nam thuc) or (nha thuoc)) va thanh tai va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ty hang) OR (ty xang)) hoc doi. hieu le ((nam thuc) OR (nha thuoc)) va thanh tai va thiet.
• Adding a wildcard symbol may retrieve word variants: te sach ((ty hang) or (ty xang)) hoc doi. hieu le ((nam thuc) or (nha thuoc)) va thanh tai va thiet*.