Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
van thanh » van tuan
tham luc » than luc, tham nuoc, tham thuc
nang xa » nang x, lang xa, nang ma
tang ma » mang may, tang van
hieu va » lieu va, hieu qua
va tham » van tham, va cham, va thanh
luu tre » luu tru, cuu tre, luy tre
vi luu » vi lua

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu cac ky ((nang xa) or (tang ma)) hoi. hieu va tham luc ((van thanh) OR (ban thanh)) vi luu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cac ky ((nang xa) OR (tang ma)) hoi. hieu va tham luc ((van thanh) OR (ban thanh)) vi luu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cac ky ((nang xa) or (tang ma)) hoi. hieu va tham luc ((van thanh) OR (ban thanh)) vi luu tre".
• Adding a wildcard symbol may retrieve word variants: tu cac ky ((nang xa) or (tang ma)) hoi. hieu va tham luc ((van thanh) OR (ban thanh)) vi luu tre*.