Perhaps you should try some spelling variations:
nang xa » nang x, lang xa, nang ma
lang ha » long ha
hieu va » lieu va, hieu qua
va cham » va chat, va tham
soc van » hoc van, oc van, sac van
van han » van hanh, van phan, van nhan
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
tai va » thai va, mai va, dai va
thiet » thieu

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 (lang ha)) hoi. hieu va cham soc van han ((tai va) or (tri va)) thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky ((nang xa) OR (lang ha)) hoi. hieu va cham soc van han ((tai va) OR (tri va)) thiet.
• Adding a wildcard symbol may retrieve word variants: tu sac ky ((nang xa) or (lang ha)) hoi. hieu va cham soc van han ((tai va) or (tri va)) thiet*.