Perhaps you should try some spelling variations:
cham loc » cham soc, chon loc, cham o
dang xay » dang van, van xay
va hanh » van hanh, va thanh, va danh
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
lang xa » lang ha, lang van
sac ky » cac ky, sai ky
loc va » hoc va, luc va
te sac » te sach, te cac, te san
ve va » ve van, te va, le va
ke va » te va

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sac ky ((lang xa) OR (dang xay)) hoi. hieu ve cham loc va hanh ((ve va) or (ke va)) trien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky ((lang xa) OR (dang xay)) hoi. hieu ve cham loc va hanh ((ve va) OR (ke va)) trien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac ky ((lang xa) OR (dang xay)) hoi. hieu ve cham loc va hanh ((ve va) or (ke va)) trien".
• Adding a wildcard symbol may retrieve word variants: te sac ky ((lang xa) OR (dang xay)) hoi. hieu ve cham loc va hanh ((ve va) or (ke va)) trien*.