Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
sach tren » sach tien, sach tranh
tren thuc » trien thuc, tron thuc, trinh thuc
hanh khoa » hang khoa, anh khoa, hanh hoa
thu thong » thuy thong, thu thang, thu tuong
trinh chu » trinh cau, trinh cho, trinh thuc
pha thong » phap thong, phan thong, pho thong
khoa thu » khoa than, hoai thu, ho thu
cac khai » cac khoi, cao khai, cac khi
khai pha » kham pha, khai thac
su sach » so sach, vu sach
tu hanh » du hanh, lu hanh, thi hanh
chu cac » cho cac, cuu cac, chu cai

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 tren thuc hanh khoa thu thong ) or ( tu hanh trinh chu cac khai pha thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( su sach tren thuc hanh khoa thu thong ) OR ( tu hanh trinh chu cac khai pha thong )).
• Adding a wildcard symbol may retrieve word variants: (( su sach tren thuc hanh khoa thu thong ) or ( tu hanh trinh chu cac khai pha thong ))*.