Perhaps you should try some spelling variations:
thanh va » thanh van, hanh va, thanh ha
va thanh » gia thanh, ban thanh, va tinh
tu sach » thu sach, te sach, tu cach
su sach » so sach, vu sach
nano xa » nano va, nano bac, nano cau
va cua » va chua, via cua, ca cua
ve cao » va cao, ve cac, ve co
ve bao » te bao, va bao
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 sach) or (su sach)) truc nano xa hoi. hieu ((ve cao) OR (ve bao)) duc va thanh va cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) truc nano xa hoi. hieu ((ve cao) OR (ve bao)) duc va thanh va cua te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (su sach)) truc nano xa hoi. hieu ((ve cao) OR (ve bao)) duc va thanh va cua te*".