Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
cua tre » cua te, cua triet, dua tren
tinh vi » trinh vi, tinh voi, tinh va
va tinh » may tinh
cam duc » cam xuc, cao duc, pham duc
sach ky » sac ky, sach y, sach ty
cuu tre » cau tren, cau treo
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
sang ma » tang ma, nang ma, sang tao
va cam » va cham, va cac, va cao

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 ((sang ma) or (lang xa)) hoi. hieu va cam duc va tinh vi ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((sang ma) OR (lang xa)) hoi. hieu va cam duc va tinh vi ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((sang ma) or (lang xa)) hoi. hieu va cam duc va tinh vi ((cua tre) or (cuu tre))*.