Perhaps you should try some spelling variations:
thanh hoa » thanh pho
tan thanh » tran thanh, tang thanh, toan thanh
hieu van » thien van, lieu va, hieu ve
hoa cua » hoa chat, hoa xuat
cam duc » cam xuc, cao duc, pham duc
hieu va » lieu va, hieu qua
so sach » so sanh, bo sach, co sach
tu nano » truc nano
tu nang » tru nang, tu nong, tu lang
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ((tu nang) or (tu nano)) xa hoi. ((hieu van) or (hieu va)) cam duc tan thanh hoa cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ((tu nang) OR (tu nano)) xa hoi. ((hieu van) OR (hieu va)) cam duc tan thanh hoa cua tre.
• Adding a wildcard symbol may retrieve word variants: so sach ((tu nang) or (tu nano)) xa hoi. ((hieu van) or (hieu va)) cam duc tan thanh hoa cua tre*.