Perhaps you should try some spelling variations:
lam tren » la tren, lap tren, nam tren
nang xa » lang xa, nang ma, mang xa
hieu ve » hieu va, hieu van
hanh gi » hanh vi, danh gia, hanh noi
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
ve cam » ve cham, ve cac, va cam
xac va » tac va, ac va, bac va
gi lam » gia lam, gio lam, si lam

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 ((xac va) or (duc va)) hanh gi lam 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 ((xac va) OR (duc va)) hanh gi lam tren.
• Adding a wildcard symbol may retrieve word variants: tu sac ky ((nang xa) or (nang x)) hoi. hieu ve cam ((xac va) or (duc va)) hanh gi lam tren*.