Perhaps you should try some spelling variations:
thanh vai » thanh van, thanh tai, thanh oai
cua triet » cua viet, su triet, va triet
thanh hai » thanh phan, thanh hoa, thanh san
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
te sach » toc sach
sach ty » sach y, sach tu, sach thu
hieu ve » hieu va, hieu van
ty nang » ky nang, ty xang, ty hang
ve cac » va cac, vien cac
x hoi » xa hoi, o hoi, x ho
thiet » thieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ty nang x hoi. hieu ve cac nuoc va ((thanh vai) or (thanh hai)) ((cua triet) or (va thiet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty nang x hoi. hieu ve cac nuoc va ((thanh vai) OR (thanh hai)) ((cua triet) OR (va thiet)).
• Adding a wildcard symbol may retrieve word variants: te sach ty nang x hoi. hieu ve cac nuoc va ((thanh vai) or (thanh hai)) ((cua triet) or (va thiet))*.