Perhaps you should try some spelling variations:
tinh luc » tinh duc, dinh luc, tinh khuc
hanh tai » thanh tai, hang tai, han tai
hanh lai » hanh lam, thanh lap, thanh loi
nang dai » nang dau, nang tai, lang dai
tu sach » thu sach, te sach, tu cach
luc van » luoc van, luu van, duc van
va tinh » may tinh
hieu va » lieu va, hieu qua
dai hoi » dai hoc, dai hai, dai moi
su sach » so sach, vu sach
cua tre » cua te, cuu tre, cua triet
v nang » va nang, vu nang, van nang

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) or (su sach)) v nang dai hoi. hieu va tinh luc van ((hanh lai) or (hanh tai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) v nang dai hoi. hieu va tinh luc van ((hanh lai) OR (hanh tai)) cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) v nang dai hoi. hieu va tinh luc van ((hanh lai) or (hanh tai)) cua tre*.