Perhaps you should try some spelling variations:
van phong » van dong, hai phong
thu sach » tu sach, thuat sach, thuoc sach
dien cuu » dien cuc, dien cua, dien chu
tang van » dang van, hoang van, trong van
nang xa » nang x, lang xa, nang ma
dien cu » dien cuc, dien cua, dien tu
sach ty » sach y, sach tu, sach thu
cam duc » cam xuc, cao duc, pham duc
duc van » duc va, duc tan, duc manh
va cam » va cham, va cac, va cao

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

• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty ((nang xa) OR (tang van)) hoi. lieu va cam duc van phong ((dien cuu) OR (dien cu)) tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ty ((nang xa) or (tang van)) hoi. lieu va cam duc van phong ((dien cuu) OR (dien cu)) tre~".
• Adding a wildcard symbol may retrieve word variants: thu sach ty ((nang xa) or (tang van)) hoi. lieu va cam duc van phong ((dien cuu) OR (dien cu)) tre*.