Perhaps you should try some spelling variations:
thanh dat » thanh san, thanh hai, thanh van
hanh tai » thanh tai, hang tai, han tai
tu sach » thu sach, su sach, te sach
cam cuc » cam xuc, cham cuu, pham cuc
cuc ban » cua ban, cac ban, cuu ban
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
tang ma » mang may, tang van
nang ma » sang ma, nang cao, mang may
ve cam » ve cham, ve cac, 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 ((nang ma) or (tang ma)) hoi. hieu ve cam cuc ban ((thanh dat) or (hanh tai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((nang ma) OR (tang ma)) hoi. hieu ve cam cuc ban ((thanh dat) OR (hanh tai)) cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((nang ma) or (tang ma)) hoi. hieu ve cam cuc ban ((thanh dat) or (hanh tai)) cua tre*.