Perhaps you should try some spelling variations:
hang tai » hang va, dung tai
su sach » so sach, vu sach
tai duc » tai cuc, mai duc, tai du
han tai » nhan tai, van tai, toan tai
hieu ve » hieu va, hieu van
sang ma » tang ma, nang ma, sang tao
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: su sach y ((sang ma) or (hang tai)) 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: su sach y ((sang ma) OR (hang tai)) hoi. hieu ve cac ((tuc va) OR (duc va)) han tai duc tre.
• Adding a wildcard symbol may retrieve word variants: su sach y ((sang ma) or (hang tai)) hoi. hieu ve cac ((tuc va) or (duc va)) han tai duc tre*.