Perhaps you should try some spelling variations:
thieu khang » chieu khong, thieu quang
nham thuc » nhan thuc, nam thuc, nham thu
toc sach » hoc sach, doc sach, thuoc sach
dieu cua » dieu tra
va dauh » va danh, va doanh
va nham » va cham, va tham, va nha
hieu va » lieu va, hieu qua
khang a » chang ha, khan gia, khang cu
va dau » va dao
de cua » le cua, te cua
a hoi » xa hoi, va hoi, o hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach thieu khang a hoi. hieu va nham thuc ((va dauh) or (va dau)) ((de cua) or (dieu cua)) tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach thieu khang a hoi. hieu va nham thuc ((va dauh) OR (va dau)) ((de cua) OR (dieu cua)) tu.
• Adding a wildcard symbol may retrieve word variants: toc sach thieu khang a hoi. hieu va nham thuc ((va dauh) or (va dau)) ((de cua) or (dieu cua)) tu*.