Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
vat thanh » dat thanh, gat thanh, tat thanh
thu nang » thi nang, thu bang, tho nang
thu hang » thi hang, thuc hanh, thu huong
so sach » so sanh, bo sach, co sach
qua nam » quan nam, quang nam, qua nhat
cua nam » cua tam, cua ngan, cua nhan
vai cua » dai cua, hai cua, lai cua
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ((thu nang) or (thu hang)) ma hoa. hieu ((qua nam) OR (cua nam)) thuc vat thanh vai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ((thu nang) OR (thu hang)) ma hoa. hieu ((qua nam) OR (cua nam)) thuc vat thanh vai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ((thu nang) or (thu hang)) ma hoa. hieu ((qua nam) OR (cua nam)) thuc vat thanh vai cua te".
• Adding a wildcard symbol may retrieve word variants: so sach ((thu nang) or (thu hang)) ma hoa. hieu ((qua nam) OR (cua nam)) thuc vat thanh vai cua te*.