Perhaps you should try some spelling variations:
sang tao » hang tai
cham duc » pham duc, cham soc, pham duy
van hanh » van thanh, ban hanh, van anh
chau tre » chay tren, chau tho, cho tre
tu sach » thu sach, su sach, te sach
hieu su » hieu sau, tieu su, hieu so
su cham » su pham, tu cham, vu cham
va hanh » va thanh, ban hanh, dao hanh
va danh » va dinh, va dan, dia danh
y sang » _ sang, duy sang

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 y sang tao boi. hieu su cham duc ((((va hanh) OR (van hanh))) or (va danh)) lai chau tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y sang tao boi. hieu su cham duc ((((va hanh) OR (van hanh))) OR (va danh)) lai chau tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y sang tao boi. hieu su cham duc ((((va hanh) OR (van hanh))) or (va danh)) lai chau tre*".