Perhaps you should try some spelling variations:
phan thong » phan thuong, phan hong, phan tong
hanh trinh » canh tranh, hanh chinh
sach thai » sach tham, sac thai, sach tai
thai thuc » thai thuy, thai tuc, tham thuc
trinh thi » trinh tai, dinh thi, trinh tu
thi thong » thi thuong, thi hong, thi khong
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
so sach » so sanh, bo sach, co sach
tu sach » thu sach, su sach, te sach
dao tuc » dao duc

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

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