Perhaps you should try some spelling variations:
sang tao » hang tai
tu sach » thu sach, su sach, te sach
tai duc » tai cuc, mai duc, tai du
han tai » hang tai, nhan tai, van tai
hieu ve » hieu va, hieu van
sang ma » tang ma, nang ma, mang may
duc tre » duoc tren, duc tien
ve cac » va cac, vien cac
tuc va » thuc va, truc va, tuc xa

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 ((tuc va) or (duc va)) han tai duc 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 ((tuc va) OR (duc va)) han tai duc tre.
• Adding a wildcard symbol may retrieve word variants: tu sach y ((sang ma) or (sang tao)) hoi. hieu ve cac ((tuc va) or (duc va)) han tai duc tre*.