Perhaps you should try some spelling variations:
khanh khoan » khanh hoa, nhanh hoan, khang khuan
sanh tranh » canh tranh, sach tranh, lanh tranh
thieu truc » hieu thuc, hieu tuc, thi truc
khoan pham » khoan phai, khoa kham, khoa phau
tranh cua » doanh cua, manh cua
cua khanh » cua thanh, cua khach, cua hang
pham cong » phan cong
bach hoa » bach khoa, bach ha, cach hoan
su sach » so sach, vu sach
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: (( su sach thieu truc bach hoa he thong ) or ( so sanh tranh cua khanh khoan pham cong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( su sach thieu truc bach hoa he thong ) OR ( so sanh tranh cua khanh khoan pham cong )).
• Adding a wildcard symbol may retrieve word variants: (( su sach thieu truc bach hoa he thong ) or ( so sanh tranh cua khanh khoan pham cong ))*.