Perhaps you should try some spelling variations:
khoan phau » khoa phau, khoan phai, khoa chau
phau thong » phap thong, khau thong, phan thong
pho thong » he thong
hoach tri » hoach toi, hoach hoi, hoach thu
sach tri » sach tai, sach tren, sach truc
tue hanh » tu hanh, tuc hanh, tue anh
hanh hoc » thanh hoc, hinh hoc, anh hoc
tu sach » thu sach, su sach, te sach
tri te » tri le, tri ve, toi te
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 tue hanh hoc pho thong ) or ( thu hoach tri te cac khoan phau thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach tri tue hanh hoc pho thong ) OR ( thu hoach tri te cac khoan phau thong )).
• Adding a wildcard symbol may retrieve word variants: (( tu sach tri tue hanh hoc pho thong ) or ( thu hoach tri te cac khoan phau thong ))*.