Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
hanh vai » hanh vi, hanh va, hanh tai
sach ky » sac ky, sach y, sach kem
sach ty » sach y, sach tu, sach thu
hieu ve » hieu va, hieu van
ve phan » va phan, ke phan, ve phat
vai cua » dai cua, hai cua, lai cua
tu van » tu va
cua cu » cua chu, cua cau, cua su

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach ky) OR (sach ty)) nang x ho. hieu ve phan tu van hanh vai cua cu~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) OR (sach ty)) nang x ho. hieu ve phan tu van hanh vai cua cu*".