Perhaps you should try some spelling variations:
hanh tai » thanh tai, hang tai, han tai
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
xuc van » luc van, vuc van, xuc ban
duc van » duc va, duc tan, duc manh
cuc tre » duc tre, cua tre, cuu tre
nang o » nang co, nang ho, nang ro
va cam » va cham, va cac, va cao
o hai » co hai, so hai, o lai

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 ky nang o hai. hieu va cam ((xuc van) or (duc van)) hanh tai cuc tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky nang o hai. hieu va cam ((xuc van) OR (duc van)) hanh tai cuc tre.
• Adding a wildcard symbol may retrieve word variants: so sach ky nang o hai. hieu va cam ((xuc van) or (duc van)) hanh tai cuc tre*.