Perhaps you should try some spelling variations:
khoan khau » khoanh khac, khoa kham, khoa phau
khau thong » khau thuong, khap thong, khau tong
pho thong » he thong
hoach tri » hoach toi, hoach hoi, hoach thu
sach tri » sach tai, sach tren, sach truc
tri thuc » tri tue
thuc anh » thuc hanh, thuy anh, thu anh
anh khoa » doanh khoa, hang khoa
khoa pho » khoa phu, khoa khoa, khoa phau
tu sach » thu sach, su sach, te sach
tri te » tri tue, tri le, tri ve
te cac » tu cac, ve cac, te cao

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