Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
ban thanh » ban hanh, ban hang
quoc ban » quoc bao, quoc lan, quoc quan
cua tre » cua te, cuu tre, cua triet
da quoc » dan quoc, da duoc, de quoc
ca viet » va viet, co viet, hoa viet
sach ky » sach y, sach ty, sach kem
sac ky » cac ky, sai ky
va da » va dao, va dau, va dap
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 ky) or (sac ky)) nang x hoi. lieu va da quoc ban thanh vai ((cua tre) or (ca viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sac ky)) nang x hoi. lieu va da quoc ban thanh vai ((cua tre) OR (ca viet)).
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sac ky)) nang x hoi. lieu va da quoc ban thanh vai ((cua tre) or (ca viet))*.