Perhaps you should try some spelling variations:
tuyet doanh » tuyet anh
doanh khoa » toan khoa
khau thong » khau thuong, khap thong, khau tong
tao tuyet » thi tuyet, dao tuyen, ba tuyet
pho thong » he thong
hoach tri » hoach toi, hoach hoi, hoach thu
hanh khoa » hang khoa, anh khoa, hanh hoa
khoa khau » khoa kham, khoa phau, khoa chau
sach tao » sach dao, sach bao, sach tai
khoa pho » khoa phu, khoa khoa, khoa phau
thi hanh » thi thanh
tu sach » thu sach, su sach, te sach
tri thi » tri tai, tai thi, thi thi

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 tao tuyet doanh khoa pho thong ) or ( thu hoach tri thi hanh khoa khau thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach tao tuyet doanh khoa pho thong ) OR ( thu hoach tri thi hanh khoa khau thong )).
• Adding a wildcard symbol may retrieve word variants: (( tu sach tao tuyet doanh khoa pho thong ) or ( thu hoach tri thi hanh khoa khau thong ))*.