Perhaps you should try some spelling variations:
nang xa » lang xa, nang ma, mang xa
hieu ve » hieu va, hieu van
la tren » loai tren, dua tren, dat tren
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
ve cam » ve cham, ve cac, va cam
xuc va » tuc va, luc va, xac va
vi la » vi lua, vi ha, gi la

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

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