Perhaps you should try some spelling variations:
xa thanh » va thanh, ha thanh, ta thanh
sach ky » sac ky, sach ty, sach kem
da hanh » dao hanh, da thanh, dan hanh
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
vi cua » vai cua, di cua
va am » va lam, va cam

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 y)) nang ma hoa. hieu va am thuc ((da hanh) or (xa thanh)) vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sach y)) nang ma hoa. hieu va am thuc ((da hanh) OR (xa thanh)) vi cua tre.
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sach y)) nang ma hoa. hieu va am thuc ((da hanh) or (xa thanh)) vi cua tre*.