Perhaps you should try some spelling variations:
cham duc » pham duc, cham soc, pham duy
hanh vai » hanh vi, hanh va, hanh van
hanh tai » thanh tai, hang tai, han tai
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
va cham » va chat, va tham
cua su » qua 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 nang x ho. hieu va cham duc tan ((hanh vai) or (hanh tai)) cua su~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang x ho. hieu va cham duc tan ((hanh vai) OR (hanh tai)) cua su.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang x ho. hieu va cham duc tan ((hanh vai) or (hanh tai)) cua su*.