Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
khoan pho » khoan nhoi, khoan phai, khoan hoi
trinh thu » trinh thuc, trinh thuy, trinh thue
thu sach » tu sach, thuat sach, thuoc sach
sach tri » sach tai, sach tren, sach truc
tri thuc » tri tue
thuc cac » thuc cach, tuc cac, phuc cac
anh khoa » doanh khoa, hang khoa
te hanh » te thanh, tu hanh, ve hanh
thu anh » thuy anh, thu canh, thu oanh
khoa he » hoa he, khoa hoc, khong he

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( thu sach tri thuc cac khoan pho thong ) or ( te hanh trinh thu anh khoa he thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( thu sach tri thuc cac khoan pho thong ) OR ( te hanh trinh thu anh khoa he thong )).
• Adding a wildcard symbol may retrieve word variants: (( thu sach tri thuc cac khoan pho thong ) or ( te hanh trinh thu anh khoa he thong ))*.