Perhaps you should try some spelling variations:
hanh tai » thanh tai, hang tai, han tai
hieu van » hieu va, thien van, lieu va
tang mai » tang ma, tang tai, lang mai
sach ky » sac ky, sach y, sach kem
tai cuu » tai cuc, tai buu, tai cua
xa hanh » xa thanh, xa khanh, va hanh
mai hoi » mai khoi, dai hoi, lai hoi
sach ty » sach y, sach tu, sach thu
cuu tre » cua tre, cau tren, cau treo

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)) tang mai hoi. hieu van ((am thuc) or (nam thu)) xa hanh tai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sach ty)) tang mai hoi. hieu van ((am thuc) OR (nam thu)) xa hanh tai cuu tre.
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sach ty)) tang mai hoi. hieu van ((am thuc) or (nam thu)) xa hanh tai cuu tre*.