Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
trinh thai » trinh tai, trinh thi, tinh thai
thai thong » thoai thong, thai hong, thai phong
phan thong » phan thuong, phan hong, phan tong
thai thuc » thai thuy, thai tuc, tham thuc
sac thai » rac thai, sach tham, toc thai
sach dao » lanh dao
tuc bich » truc bach, thi bich, suc tich
bich hai » bich ha, lich thai, tinh hai
hai phan » thai phan, tai phan, hai pham
tu sach » thu sach, su sach, te sach
dao tuc » dao duc
so sac » so sach, so dac

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( so sac thai thuc hanh trinh thai thong ) or ( tu sach dao tuc bich hai phan thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( so sac thai thuc hanh trinh thai thong ) OR ( tu sach dao tuc bich hai phan thong )).
• Adding a wildcard symbol may retrieve word variants: (( so sac thai thuc hanh trinh thai thong ) or ( tu sach dao tuc bich hai phan thong ))*.