Perhaps you should try some spelling variations:
nha thuoc » nha nuoc, nhan thuc, nha hoc
nha quoc » nhap quoc, nhan quoc, nha nuoc
dang xay » dang van, van xay
hieu van » hieu va, thien van, lieu va
nam thuc » nam thuoc, am thuc, nam thu
te sach » toc sach
vai cuu » vai cua
dau vai » dau va, dau hai, dau tai
cuu tre » cua tre, cau tren, cau treo
xay hoi » xa hoi, tay hoi, cay phoi
sach 2 » sach y
va dau » va dao
2 dang » 2 danh, _ dang, b dang

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 2 dang xay hoi. hieu van ((nam thuc) or (((nha thuoc) or (nha quoc)))) va dau vai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach 2 dang xay hoi. hieu van ((nam thuc) OR (((nha thuoc) OR (nha quoc)))) va dau vai cuu tre.
• Adding a wildcard symbol may retrieve word variants: te sach 2 dang xay hoi. hieu van ((nam thuc) or (((nha thuoc) or (nha quoc)))) va dau vai cuu tre*.