Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
thi hanh » thi thanh
hanh cua » manh cua, hang cua, hanh sua
xa khanh » xa thanh, van khanh, dat khanh
sach thi » sach thu, sach tai, sach thieu
va hanh » van hanh, va thanh, ban hanh
vai cua » dai cua, hai cua, lai cua
cac toc » cac toi, cac thoi
hieu va » lieu va, hieu qua
cua hoi » cua moi

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach thi hanh cua hoi. hieu va ((cac toc) or (cac nuoc)) ((va hanh) or (xa khanh)) vai cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach thi hanh cua hoi. hieu va ((cac toc) OR (cac nuoc)) ((va hanh) OR (xa khanh)) vai cua vat.
• Adding a wildcard symbol may retrieve word variants: toc sach thi hanh cua hoi. hieu va ((cac toc) or (cac nuoc)) ((va hanh) or (xa khanh)) vai cua vat*.