Perhaps you should try some spelling variations:
than thong » than thuong, toan thong, tran thong
phai thong » phap thong, phai tuong, phan thong
toan phai » toan phan, khoan phai, toan tai
sach tren » sach tien, sach tranh
khoa than » khoa luan, hoa thai, hoa tan
sach tai » sach bai, sach tham, sach dao
anh toan » manh toan, anh tuan, thanh toan
anh khoa » doanh khoa, hang khoa
so sach » so sanh, bo sach, co sach
te sach » toc sach
tren vu » tran vu, tren vi, tren vung
tu anh » tu hanh, tu manh, thu anh
vu anh » vu khanh, vu thanh

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 tai tu anh toan phai thong ) or ( te sach tren vu anh khoa than thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( so sach tai tu anh toan phai thong ) OR ( te sach tren vu anh khoa than thong ))*.