Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van chao » van chat, van hao, van cho
chua tre » chua tri, cua tre, chua trieu
tu sach » thu sach, su sach, te sach
nang ma » tang ma, sang ma, nang cao
va tinh » may tinh
va chua » vua chua, ca chua, va chu
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa

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 ma hoi. hieu van chao xu ((va tinh) or (van minh)) va chua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang ma hoi. hieu van chao xu ((va tinh) OR (van minh)) va chua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ma hoi. hieu van chao xu ((va tinh) or (van minh)) va chua tre*.