Perhaps you should try some spelling variations:
hang dien » quang dien, dang dieu, nhan dien
toc sach » hoc sach, doc sach, thuoc sach
dien cua » dieu cua, dien cuc, dien cu
tu nang » tru nang, tu nong, tu lang
tu nano » truc nano
qua cam » qua cham, qua cac, qua ca
xuc va » tuc va, luc va, xac va
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: toc sach ((tu nang) or (tu nano)) xa hoi. hieu qua cam ((xuc va) OR (duc va)) hang dien cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((tu nang) OR (tu nano)) xa hoi. hieu qua cam ((xuc va) OR (duc va)) hang dien cua te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ((tu nang) or (tu nano)) xa hoi. hieu qua cam ((xuc va) OR (duc va)) hang dien cua te*".