Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
van thanh » ban thanh, van tuan
cua viet » ca viet, hoa viet, cua vat
chat duc » chat xuc, chat doc, chet duoc
duc van » duc va, duc tan, duc manh
ve chat » va chat, van chat
hieu ve » hieu va, hieu van
tu sach » thu sach, te sach, tu cach
ty nang » ky nang, ty xang, ty hang
so sach » so sanh, bo sach, co sach
su sach » vu sach
x hoi » xa hoi, o hoi, x ho

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))) or (so sach)) ty nang x hoi. hieu ve chat duc van thanh dai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((tu sach) OR (su sach))) OR (so sach)) ty nang x hoi. hieu ve chat duc van thanh dai cua viet.
• Adding a wildcard symbol may retrieve word variants: ((((tu sach) or (su sach))) or (so sach)) ty nang x hoi. hieu ve chat duc van thanh dai cua viet*.