Perhaps you should try some spelling variations:
tang tai » hang tai, dung tai, sang tao
sang tai » hang tai, sang tao, sang than
hanh tai » thanh tai, hang tai, han tai
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
cam luc » cam xuc, cau luc
va hanh » van hanh, va thanh, va danh
tai cua » thai cua, tai cuc, tri cua
cua tre » cua te, cuu tre, cua triet
ve cam » ve cham, ve cac, va cam
luc va » duc va, tuc va, loc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach y ((tang tai) or (sang tai)) roi. hieu ve cam luc va hanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y ((tang tai) OR (sang tai)) roi. hieu ve cam luc va hanh tai cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach y ((tang tai) or (sang tai)) roi. hieu ve cam luc va hanh tai cua tre*.