Perhaps you should try some spelling variations:
danh kien » dinh kien, danh viet, linh kien
hieu van » hieu va, thien van, lieu va
ca tren » cau tren, cu tren, la tren
kien ca » kien ha, kien va, bien ca
van cam » van nam, van lam, van cau
nang xa » lang xa, nang ma, mang xa
dan ky » van ky
xuc va » duc va, tuc va, xac va
luc va » duc va, tuc va, loc va
tu dan » tuc dan, tu ban, cu dan

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu dan ky ((nang xa) or (nang x)) hoi. hieu van cam ((xuc va) OR (luc va)) danh kien ca tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu dan ky ((nang xa) OR (nang x)) hoi. hieu van cam ((xuc va) OR (luc va)) danh kien ca tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu dan ky ((nang xa) or (nang x)) hoi. hieu van cam ((xuc va) OR (luc va)) danh kien ca tren".
• Adding a wildcard symbol may retrieve word variants: tu dan ky ((nang xa) or (nang x)) hoi. hieu van cam ((xuc va) OR (luc va)) danh kien ca tren*.