Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
tham luc » than luc, tham nuoc, tham thuc
thanh di » thanh doi, thanh de, thanh do
cua viet » ca viet, hoa viet, cua vat
dang xa » dang xay, dang ha, dang va
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
va tham » van tham, va cham, va thanh
luc van » luoc van, luu van, duc van
tu van » tu va
di cua » dai cua, doi cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu van ky ((dang xa) or (lang xa)) hoi. hieu va tham luc van thanh di cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu van ky ((dang xa) OR (lang xa)) hoi. hieu va tham luc van thanh di cua viet.
• Adding a wildcard symbol may retrieve word variants: tu van ky ((dang xa) or (lang xa)) hoi. hieu va tham luc van thanh di cua viet*.