Perhaps you should try some spelling variations:
phau thong » phap thong, khau thong, phan thong
xanh khong » nganh khong, anh thong, benh khong
sach thai » sach tham, sac thai, sach tai
tri thuoc » tri thuc, tri hoc, tin thuoc
thuoc tan » thuoc tai, thuoc ban, thuoc tren
khoa phau » hoa phan, khoa kham, khoa than
hoc sach » hoc sinh, hoc cac, hoc anh
thai hoc » dai hoc, bai hoc, hoi hoc
hoc xanh » hoc anh, hoc hanh, hoc danh
khong he » khong khi, hong ha, khong _
sach tri » sach tai, sach tren, sach truc
tan khoa » toan khoa, tran khoa, san khoa
tu sach » thu sach, su sach, te sach

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (( hoc sach thai hoc xanh khong he thong ) or ( tu sach tri thuoc tan khoa phau thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( hoc sach thai hoc xanh khong he thong ) OR ( tu sach tri thuoc tan khoa phau thong )).
• Adding a wildcard symbol may retrieve word variants: (( hoc sach thai hoc xanh khong he thong ) or ( tu sach tri thuoc tan khoa phau thong ))*.