Perhaps you should try some spelling variations:
thuc nano » truc nano, chuc nang, thuc dan
luoc can » luc canh, hoc can, luoc dai
tu cach » tu cac
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
luu van » cuu van, luan van, luu hanh
vi cua » vai cua, di cua
cua te » cua tu

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 ((thuc nano) OR (thuc hanh)) xa hoi. hieu ve cham ((luu van) or (luoc can)) hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cach ((thuc nano) OR (thuc hanh)) xa hoi. hieu ve cham ((luu van) OR (luoc can)) hanh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cach ((thuc nano) OR (thuc hanh)) xa hoi. hieu ve cham ((luu van) or (luoc can)) hanh vi cua te".
• Adding a wildcard symbol may retrieve word variants: tu cach ((thuc nano) OR (thuc hanh)) xa hoi. hieu ve cham ((luu van) or (luoc can)) hanh vi cua te*.