Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
tru nang » tra nang, tri nang, truc nano
mai khoa » tai khoa, may khoa, dai khoa
vien cac » vien bach, vien dai, vien da
tu cach » tu cac
tu nang » tu nong, tu nano, tu lang
va hanh » van hanh, va thanh, va danh
cac duc » cac du, cao duc, cac dac
lai roi » lai hoi, loi roi
vi hoa » voi hoa, vi hoc, va hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu cach ((tu nang) OR (tru nang)) ((mai khoa) or (lai roi)). hieu vien cac duc va hanh vi hoa viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cach ((tu nang) OR (tru nang)) ((mai khoa) OR (lai roi)). hieu vien cac duc va hanh vi hoa viet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cach ((tu nang) OR (tru nang)) ((mai khoa) or (lai roi)). hieu vien cac duc va hanh vi hoa viet*".