Perhaps you should try some spelling variations:
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
cac duc » cac du, cao duc, cac nuoc
cac dac » cac dan, cac dai, cac bac
va danh » va dinh, va dan, va hanh
hoi cua » hoi chuc
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky

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 hoi. hieu va ((cac duc) or (cac dac)) va danh ((hoi cua) or (dai cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang xa hoi. hieu va ((cac duc) OR (cac dac)) va danh ((hoi cua) OR (dai cua)) te.
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang xa hoi. hieu va ((cac duc) or (cac dac)) va danh ((hoi cua) or (dai cua)) te*.