Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
dang van » hoang van, hang va
dai tai » dai hai, dai thao
da hanh » dao hanh, da thanh, dan hanh
ky dang » ky nang, ky danh
dai tac » doi tac, da tac, dai dac
vi cua » vai cua, di cua
cua te » cua tu
tu san » thu san, tu ban, tu can

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu cac) or (tu san)) ky dang van hoa. hieu vien ((dai tac) OR (dai tai)) da hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cac) OR (tu san)) ky dang van hoa. hieu vien ((dai tac) OR (dai tai)) da hanh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu cac) or (tu san)) ky dang van hoa. hieu vien ((dai tac) OR (dai tai)) da hanh vi cua te".
• Adding a wildcard symbol may retrieve word variants: ((tu cac) or (tu san)) ky dang van hoa. hieu vien ((dai tac) OR (dai tai)) da hanh vi cua te*.