Perhaps you should try some spelling variations:
khoan phau » khoa phau, khoan phai, khoa chau
phau thong » phap thong, khau thong, phan thong
hoach toi » hoach hoi, hoach toan, hoach do
sach tren » sach tien, sach tranh
tren thuc » trien thuc, tron thuc, trinh thuc
thuc cach » thuoc sach, truoc cach, thuc hanh
cach khoa » bach khoa, cac khoa, anh khoa
pho thong » he thong
toi thuc » tri thuc, noi thuc, thi thuc
thuc cac » tuc cac, phuc cac, thac cac
khoa pho » khoa phu, khoa khoa, khoa phau
te sach » toc sach

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 toi thuc cac khoan phau thong ) or ( te sach tren thuc cach khoa pho thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( thu hoach toi thuc cac khoan phau thong ) OR ( te sach tren thuc cach khoa pho thong ))*.