Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
thuat san » thuat toan, thuat song, thuat lanh
danh sai » dung sai, danh bat, danh dau
day nano » dan nano, day nang, day nhanh
hieu van » hieu va, thien van, lieu va
sai cua » dai cua, hai cua, lai cua
va danh » va dinh, va dan, va hanh
dau luc » cau luc, dau luan, dau nuoc
van dau » van dao, phan dau
ty nano » tu nano, tao nano
luc va » duc va, tuc va, loc 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: ((thuoc sach) or (thuat san)) ((ty nano) or (day nano)) xa hoi. hieu van dau luc va danh sai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuoc sach) OR (thuat san)) ((ty nano) OR (day nano)) xa hoi. hieu van dau luc va danh sai cua te.
• Adding a wildcard symbol may retrieve word variants: ((thuoc sach) or (thuat san)) ((ty nano) or (day nano)) xa hoi. hieu van dau luc va danh sai cua te*.