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
khang cu » khung cua, thang cua, chung cu
dieu cua » dieu tra
va hanh » van hanh, va thanh, ban hanh
va danh » va dinh, va dan, dia danh
va nham » va cham, va tham, va nha
hieu va » lieu va, hieu qua
de cua » le cua, te cua
cu hoi » cau hoi, cua hoi, cuu 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 cu hoi. hieu va nham thuc ((va danh) OR (va hanh)) ((de cua) or (dieu cua)) tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach thieu khang cu hoi. hieu va nham thuc ((va danh) OR (va hanh)) ((de cua) OR (dieu cua)) tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach thieu khang cu hoi. hieu va nham thuc ((va danh) OR (va hanh)) ((de cua) or (dieu cua)) tu".
• Adding a wildcard symbol may retrieve word variants: toc sach thieu khang cu hoi. hieu va nham thuc ((va danh) OR (va hanh)) ((de cua) or (dieu cua)) tu*.