Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
chat tuu » chat huu, chat cua, chat xuc
cua dieu » va dieu
va thanh » gia thanh, ban thanh, va tinh
tu sach » thu sach, su sach, te sach
va chat » van chat, va phat, cao chat
hieu va » lieu va, hieu qua
tuu va » tu va, cuu va, tru va
o viet » so viet, hoc viet

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 ((thi hanh) or (thi thanh)) xa hoi. hieu va chat tuu va thanh tai ((cua dieu) or (o viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((thi hanh) OR (thi thanh)) xa hoi. hieu va chat tuu va thanh tai ((cua dieu) OR (o viet)).
• Adding a wildcard symbol may retrieve word variants: tu sach ((thi hanh) or (thi thanh)) xa hoi. hieu va chat tuu va thanh tai ((cua dieu) or (o viet))*.