Perhaps you should try some spelling variations:
hanh mayi » hanh ma, hanh mau, hanh tai
tai hanh » tai thanh, tai nhanh, thi hanh
hanh may » hanh ma, hanh mau, hanh ngay
va trien » va truyen, va tuyen, va tieng
sach tai » sach bai, sach tham, sach dao
tu sach » thu sach, su sach, te sach
xa hanh » xa thanh, xa khanh, va hanh
va chat » van chat, va phat, cao chat
ve chat » van chat
may hoi » may thoi, tay hoi, mai hoi
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: tu sach tai hanh may hoi. hieu ((ve chat) OR (va chat)) tuc xa hanh mayi ((va trien) or (va thiet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach tai hanh may hoi. hieu ((ve chat) OR (va chat)) tuc xa hanh mayi ((va trien) OR (va thiet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach tai hanh may hoi. hieu ((ve chat) OR (va chat)) tuc xa hanh mayi ((va trien) or (va thiet))".
• Adding a wildcard symbol may retrieve word variants: tu sach tai hanh may hoi. hieu ((ve chat) OR (va chat)) tuc xa hanh mayi ((va trien) or (va thiet))*.