Perhaps you should try some spelling variations:
sang mai » sang ma, sang tai, lang mai
cham tuc » nham thuc, pham thuc, tham thuc
nam thuc » nam thuoc, am thuc, nam thu
ky sang » ky nang, ky dang, ky tang
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu va, hieu van
cuu tre » cua tre, cau tren, cau treo
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
va don » va dong, va doc, va do
vi cuu » vi luu, vinh cuu

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky sang mai hoi. hieu ve ((cham tuc) or (nam thuc)) va don vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky sang mai hoi. hieu ve ((cham tuc) OR (nam thuc)) va don vi cuu tre.
• Adding a wildcard symbol may retrieve word variants: tu sac ky sang mai hoi. hieu ve ((cham tuc) or (nam thuc)) va don vi cuu tre*.