Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
cuc viet » chuc viet, tuc viet, cua viet
sach thi » sach thu, sach tai, sach thieu
van hanh » ban hanh, van anh, van ban
hanh ma » hanh mau, hanh may, hanh va
hieu ve » hieu va, hieu van
hanh xa » hanh va, hanh xu, canh xa
tu sach » thu sach, su sach, te sach
ve am » va am

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 xa) OR (hanh ma)) hoi. hieu ve am thuc ((van hanh) or (van thanh)) tai cuc viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thi ((hanh xa) OR (hanh ma)) hoi. hieu ve am thuc ((van hanh) OR (van thanh)) tai cuc viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach thi ((hanh xa) OR (hanh ma)) hoi. hieu ve am thuc ((van hanh) or (van thanh)) tai cuc viet".
• Adding a wildcard symbol may retrieve word variants: tu sach thi ((hanh xa) OR (hanh ma)) hoi. hieu ve am thuc ((van hanh) or (van thanh)) tai cuc viet*.