Perhaps you should try some spelling variations:
nang doc » nang luc
hang tai » hang va, dung tai
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
doc hai » hoc hai, duc hai, do hai
hieu va » lieu va, hieu qua
cac xuc » cam xuc, cac nuoc, chat xuc
xuc ban » duc ban, cuc ban, quoc ban
han tai » nhan tai, van tai, toan tai
cua tre » cua te, cuu tre, cua triet

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 doc hai. hieu va cac xuc ban ((han tai) or (hang tai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang doc hai. hieu va cac xuc ban ((han tai) OR (hang tai)) cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang doc hai. hieu va cac xuc ban ((han tai) or (hang tai)) cua tre*.