Perhaps you should try some spelling variations:
tren nguoi » ten nguoi, truyen nguoi, trien nguon
nguoi bach » nguoi sach, nguoi bac, nguoi benh
bach khang » bac thang, bach dang
pham nguoi » phau nguoi, phai nguoi, pham ngoc
sanh tren » sach tren, lanh tren, sinh tren
sanh pham » san pham, thanh pham, khanh pham
nguoi dao » nguoi tay
hoc thong » hoc thuong, hoc trong, hoc hong
khang he » khong he, khang kho, hang ha
dao khoa » da khoa, lao khoa, dac khoa
khoa hoc » hoa hoc
so sanh » do sanh

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 tren nguoi bach khang he thong ) or ( so sanh pham nguoi dao khoa hoc thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( so sanh tren nguoi bach khang he thong ) OR ( so sanh pham nguoi dao khoa hoc thong )).
• Adding a wildcard symbol may retrieve word variants: (( so sanh tren nguoi bach khang he thong ) or ( so sanh pham nguoi dao khoa hoc thong ))*.