Perhaps you should try some spelling variations:
trinh thuoc » trinh thuc, trinh thuong, tri thuoc
sanh thieu » sach thieu, thanh thieu, hanh thiet
thieu thuy » thi thuy, tieu thu, thu thuy
hanh trinh » canh tranh, hanh chinh
thuoc sach » hoc sach, nuoc sach, thuat sach
khoa thong » hoa thong, thoai thong, pho thong
anh khong » xanh khong, anh thong, nganh khong
sach mang » cach mang, sach nang, hoach mang
mang khoa » hang khoa, dang khoa, vang khoa
thuy anh » thuy linh
khong he » khong khi, hong ha, khong _
so sanh » do sanh
du hanh » dieu hanh, duy khanh, luu hanh

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( so sanh thieu thuy anh khong he thong ) or ( du hanh trinh thuoc sach mang khoa thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( so sanh thieu thuy anh khong he thong ) OR ( du hanh trinh thuoc sach mang khoa thong )).
• Adding a wildcard symbol may retrieve word variants: (( so sanh thieu thuy anh khong he thong ) or ( du hanh trinh thuoc sach mang khoa thong ))*.