Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
phau thong » phap thong, khau thong, phan thuong
phan thong » phan thuong, phan hong, phan tong
sach khoa » bach khoa, sach nha, anh khoa
khoa phau » hoa phan, khoa kham, khoa than
thuc sach » thuoc sach, thuc cach, thuc hanh
sach nghe » sach nghiep, sach nha, anh nghe
nghe phan » nghe nhan, nghe thang, nghe dan
hoach ki » hoach hoi, hoach toi, hoach su
ki thuat » ky thuat
thu sach » tu sach, thuoc sach, khau sach
sach tri » sach tai, sach tren, sach truc
tri thuc » tri tue

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( thu hoach ki thuat sach khoa phau thong ) or ( thu sach tri thuc sach nghe phan thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( thu hoach ki thuat sach khoa phau thong ) OR ( thu sach tri thuc sach nghe phan thong )).
• Adding a wildcard symbol may retrieve word variants: (( thu hoach ki thuat sach khoa phau thong ) or ( thu sach tri thuc sach nghe phan thong ))*.