Perhaps you should try some spelling variations:
hinh thai » sinh thai, tinh thai, dinh thi
cau treo » cau theo, cau tren, cau triet
cua tre » cua te, cuu tre, cua triet
va hinh » va chinh, va kinh, va tinh
ve pham » vi pham, v pham, ve phan
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
hieu ve » hieu va, hieu van

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 ((nang xa) or (nang ma)) hoi. hieu ve pham duc va hinh thai ((cua tre) or (cau treo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((nang xa) OR (nang ma)) hoi. hieu ve pham duc va hinh thai ((cua tre) OR (cau treo)).
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((nang xa) or (nang ma)) hoi. hieu ve pham duc va hinh thai ((cua tre) or (cau treo))*.