Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
va thanh » gia thanh, ban thanh, va tinh
nang mai » nang ma, nang tai, lang mai
sach ky » sach y, sach ty, sach kem
mai hoi » mai khoi, dai hoi, lai hoi
cua tre » cua te, cuu tre, cua triet
sac ky » cac ky, sai ky
ve cam » ve cham, ve cac, ve cai
va cam » va cham, va cac, va cao
xuc va » duc va, tuc va, luc va

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

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