Perhaps you should try some spelling variations:
than thong » than thuong, toan thong, tran thong
thang khoa » hang khoa, thong khoa, thanh hoa
hoach hoi » hoc hoi, hoach ha, sach hoi
pho thong » he thong
khoa than » khoa luan, hoa thai, hoa tan
khoa pho » khoa phu, khoa khoa, khoa phau
sach tri » sach tai, sach tren, sach truc
tri thuc » tri tue
thuc cac » thuc cach, tuc cac, phuc cac
cac khoa » cac khoan, cac khoi, dac khoa
e thang » le thang, ke thang, 1 thang
tu sach » thu sach, su sach, te sach
hoi e » hoi ve, hoi le, hoi _

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