Perhaps you should try some spelling variations:
nang mai » nang ma, nang tai, lang mai
tu sach » thu sach, su sach, te sach
hanh di » hanh de, hang di, danh di
cuu tre » cua tre, cau tren, cau treo
hieu va » lieu va, hieu qua
mai hoi » mai khoi, dai hoi, lai hoi
va lam » van lam, va lap
y nang » ky nang, ly nang, v nang
loc va » luc va

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 y nang mai hoi. hieu va lam ((loc va) or (hoc va)) ((hanh di) or (hanh vi)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang mai hoi. hieu va lam ((loc va) OR (hoc va)) ((hanh di) OR (hanh vi)) cuu tre.
• Adding a wildcard symbol may retrieve word variants: tu sach y nang mai hoi. hieu va lam ((loc va) or (hoc va)) ((hanh di) or (hanh vi)) cuu tre*.