Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
dieu cua » dieu tra
thu san » thuy san, thu ban, phu san
cac dac » cac dan, cac dai, cac bac
va lang » va nang, hoa lang
nang xa » nang x, lang xa, nang ma
cac duc » cac du, cao duc, cac nuoc
san ky » sang ky, van ky, dan ky
de cua » le cua, te cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu san ky nang xa hoi. hieu vien ((cac duc) or (cac dac)) va lang ((de cua) OR (dieu cua)) tuc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu san ky nang xa hoi. hieu vien ((cac duc) OR (cac dac)) va lang ((de cua) OR (dieu cua)) tuc.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu san ky nang xa hoi. hieu vien ((cac duc) or (cac dac)) va lang ((de cua) OR (dieu cua)) tuc".
• Adding a wildcard symbol may retrieve word variants: thu san ky nang xa hoi. hieu vien ((cac duc) or (cac dac)) va lang ((de cua) OR (dieu cua)) tuc*.