Perhaps you should try some spelling variations:
sach trien » sach tien, sach tren, sach thieu
trien nhan » trien nha, tri nhan, trien khai
khau thong » khau thuong, khap thong, khau tong
khoan khau » khoanh khac, khoa kham, khoa phau
nhan cach » phan cac
cach khoa » bach khoa, cac khoa, anh khoa
khoa khau » khoa kham, khoa phau, khoa chau
sach tham » sach nha
tu sach » thu sach, su sach, te sach
tham tu » pham tu, tam tu, tham du

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 trien nhan cach khoa khau thong ) or ( tu sach tham tu cac khoan khau thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach trien nhan cach khoa khau thong ) OR ( tu sach tham tu cac khoan khau thong )).
• Adding a wildcard symbol may retrieve word variants: (( tu sach trien nhan cach khoa khau thong ) or ( tu sach tham tu cac khoan khau thong ))*.