Perhaps you should try some spelling variations:
nang tai » hang tai, tang tai, nang cao
sang tai » hang tai, sang tao, tang tai
cam thuc » am thuc, nam thuc, cam thu
vat hanh » vat thanh, van hanh, va hanh
hanh hai » thanh hai, nhanh hai, hang hai
hieu ve » hieu va, hieu van
hai cua » thai cua, dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky
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: su sac ky ((nang tai) or (sang tai)) roi. hieu ve cam thuc vat hanh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky ((nang tai) OR (sang tai)) roi. hieu ve cam thuc vat hanh hai cua tre.
• Adding a wildcard symbol may retrieve word variants: su sac ky ((nang tai) or (sang tai)) roi. hieu ve cam thuc vat hanh hai cua tre*.