Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
va thanh » gia thanh, ban thanh, va tinh
sach ky » sach y, sach ty, sach kem
cam duc » cam xuc, cao duc, pham duc
hieu va » lieu va, hieu qua
lang ha » long ha
cua tre » cua te, cuu tre, cua triet
nang ma » tang ma, sang ma, nang cao
va cam » va cham, va cac, va cao
sac ky » cac ky, sai ky

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sach ky) OR (sac ky)) ((nang ma) or (lang ha)) hoi. hieu va cam duc va thanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sac ky)) ((nang ma) OR (lang ha)) hoi. hieu va cam duc va thanh dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ky) OR (sac ky)) ((nang ma) or (lang ha)) hoi. hieu va cam duc va thanh dai cua tre".
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) OR (sac ky)) ((nang ma) or (lang ha)) hoi. hieu va cam duc va thanh dai cua tre*.