Perhaps you should try some spelling variations:
sang tao » hang tai
hanh tai » thanh tai, hang tai, han tai
tu sach » thu sach, su sach, te sach
sang ma » tang ma, nang ma, mang may
hieu ve » hieu va, hieu van
cuc tre » duc tre, cua tre, cuu tre
ve cac » va cac, vien cac
xac va » tac va, ac va, bac va

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 y ((sang ma) or (sang tao)) hoi. hieu ve cac ((xac va) or (duc va)) hanh tai cuc tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y ((sang ma) OR (sang tao)) hoi. hieu ve cac ((xac va) OR (duc va)) hanh tai cuc tre.
• Adding a wildcard symbol may retrieve word variants: tu sach y ((sang ma) or (sang tao)) hoi. hieu ve cac ((xac va) or (duc va)) hanh tai cuc tre*.