Perhaps you should try some spelling variations:
thuat lanh » thuat lap, thuat san
van hanh » van thanh, ban hanh, van anh
luu van » cuu van, luan van, luu hanh
cac luu » cac luat, sach luu
hieu ve » hieu va, hieu van
ve cac » va cac, vien cac
ma hoi » mai hoi, ma hoa, me hoi
va cuu » va cau, va huu
va chu » va che, va cau, va chi

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat lanh _ sang ((ma hoi) or (xa hoi)). hieu ve cac luu van hanh ((va cuu) OR (va chu)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat lanh _ sang ((ma hoi) OR (xa hoi)). hieu ve cac luu van hanh ((va cuu) OR (va chu)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat lanh _ sang ((ma hoi) or (xa hoi)). hieu ve cac luu van hanh ((va cuu) OR (va chu)) tre".
• Adding a wildcard symbol may retrieve word variants: thuat lanh _ sang ((ma hoi) or (xa hoi)). hieu ve cac luu van hanh ((va cuu) OR (va chu)) tre*.