Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
nam duoc » nam thuoc, da duoc, dat duoc
nhan hai » nhanh hai, nhan tai, chan hai
tu cach » tu cac
nang ma » tang ma, sang ma, nang cao
va nhan » van nhan, ca nhan, va phan
hai cuu » hai cua, hai chu, hai cuc
cuu tre » cua tre, cau tren, cau treo
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 cach) or (thu sach)) ky nang ma hoi. hieu van ((nam duoc) or (pham duc)) va nhan hai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (thu sach)) ky nang ma hoi. hieu van ((nam duoc) OR (pham duc)) va nhan hai cuu tre.
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (thu sach)) ky nang ma hoi. hieu van ((nam duoc) or (pham duc)) va nhan hai cuu tre*.