Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
thu oanh » thuy oanh, thi oanh, thu anh
thu canh » thuc hanh, thu cong, thu ban
tru nang » tra nang, tri nang, truc nano
vien cao » vien cac, vien dai, vien da
van hanh » van thanh, ban hanh, van anh
nang xa » nang x, lang xa, nang ma
cao duc » dao duc, cao suc, giao duc
duc van » duc va, duc tan, duc manh
hanh va » hang va, hanh vi
va cua » va chua, via cua, ca 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: ((thu oanh) OR (thu canh)) tru nang xa hoi. hieu vien cao duc van hanh va cua tu~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu oanh) OR (thu canh)) tru nang xa hoi. hieu vien cao duc van hanh va cua tu".
• Adding a wildcard symbol may retrieve word variants: ((thu oanh) OR (thu canh)) tru nang xa hoi. hieu vien cao duc van hanh va cua tu*.