Perhaps you should try some spelling variations:
sach tranh » canh tranh
tranh cong » thanh cong, trinh cong, tran cong
nghe thong » he thong
hoa truyen » co truyen
va truyen » co truyen, tu truyen
di truyen » co truyen
tu sach » thu sach, su sach, te sach

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 tranh cong nghe thong tin ((((va truyen) or (di truyen))) or (hoa truyen)) thong~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach tranh cong nghe thong tin ((((va truyen) OR (di truyen))) OR (hoa truyen)) thong.
• Adding a wildcard symbol may retrieve word variants: tu sach tranh cong nghe thong tin ((((va truyen) or (di truyen))) or (hoa truyen)) thong*.