Perhaps you should try some spelling variations:
sach tham » sach nha
van phan » van phong, van thanh, luan phan
hanh tai » thanh tai, hang tai, han tai
hanh vai » hanh vi, hanh va, hanh van
hieu van » hieu va, thien van, lieu va
sach thu » sach thue, sach thieu, cach thuc
phan cuu » phan cau, phan huu, phan cung
bang ma » bang may, tang ma, ban ma
cuu va » cuu van, cuu ve
cua tu » cua tuc, cua su, cua cu

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) or (sach tham)) bang ma hoa. hieu van phan cuu va ((hanh vai) or (hanh tai)) cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so ((sach thu) OR (sach tham)) bang ma hoa. hieu van phan cuu va ((hanh vai) OR (hanh tai)) cua tu.
• Adding a wildcard symbol may retrieve word variants: so ((sach thu) or (sach tham)) bang ma hoa. hieu van phan cuu va ((hanh vai) or (hanh tai)) cua tu*.