Perhaps you should try some spelling variations:
sach tranh » canh tranh
tranh thuc » trinh thuc, trang thuc, thanh thuy
khoan phan » khoan phai, khoan thanh, hoa phan
phan thong » phan thuong, phan hong, phan tong
thuoc cac » thuoc cuc, thuoc cao, thuoc dac
pho thong » he thong
thuc cac » thuc cach, tuc cac, phuc cac
tu thuoc » truc thuoc, tu thuong, cua thuoc
cac khoa » cac khoi, dac khoa, cao khoa
khoa pho » khoa phu, khoa khoa, khoa phau
su sach » so sach, vu sach
cac tu » cac thu, cach tu, cac du

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 tranh thuc cac khoan phan thong ) or ( tu cac tu thuoc cac khoa pho thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( su sach tranh thuc cac khoan phan thong ) OR ( tu cac tu thuoc cac khoa pho thong )).
• Adding a wildcard symbol may retrieve word variants: (( su sach tranh thuc cac khoan phan thong ) or ( tu cac tu thuoc cac khoa pho thong ))*.