Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
thu san » thuy san, thu ban, phu san
nang xa » nang x, lang xa, nang ma
cac duc » cac du, cac dac, cac nuoc
cao duc » dao duc, cao suc, giao duc
va hanh » van hanh, va thanh, va danh
san ky » sang ky, van ky, dan ky
di cua » dai cua, doi cua, do cua
de cua » le cua, te cua, dieu 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 (cao duc)) va hanh ((di cua) or (de cua)) cu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu san ky nang xa hoi. hieu vien ((cac duc) OR (cao duc)) va hanh ((di cua) OR (de cua)) cu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu san ky nang xa hoi. hieu vien ((cac duc) OR (cao duc)) va hanh ((di cua) or (de cua)) cu".
• Adding a wildcard symbol may retrieve word variants: thu san ky nang xa hoi. hieu vien ((cac duc) OR (cao duc)) va hanh ((di cua) or (de cua)) cu*.