Perhaps you should try some spelling variations:
sach ky » sac ky, sach y, sach kem
sach ty » sach y, sach tu, sach thu
hieu ve » hieu va, hieu van
cac duc » cac du, cao duc, cac dac
va hanh » van hanh, va thanh, va danh
cuu tre » cua tre, cau tren, cau treo
ve cac » va cac, vien cac
vi cuu » vi luu, vinh cuu

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) or (sach ty)) ((nang x) or (nang cao)) hoi. hieu ve cac duc va hanh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sach ty)) ((nang x) OR (nang cao)) hoi. hieu ve cac duc va hanh vi cuu tre.
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sach ty)) ((nang x) or (nang cao)) hoi. hieu ve cac duc va hanh vi cuu tre*.