Perhaps you should try some spelling variations:
phu san » phi san, thuy san
hanh di » hanh vi, hanh de, hang di
va hanh » van hanh, va thanh, va danh
cac dac » cac dan, cac dai, cac bac
hieu ve » hieu va, hieu van
cac duc » cac du, cao duc, cac nuoc
ky tang » ky nang, ky dang, kho tang
ky lang » ky nang, ky dang, tay lang
di cua » dai cua, doi cua, de cua
cua tu » cua tuc, cua su, cua cu

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

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