Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
hanh tai » hang tai, han tai, hinh tai
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
cau hoa » cau hoi
ty hang » ly hang, ty xang, thi hang
ty dang » ty xang, ky dang, ty dong
duc tre » duoc tren, duc tien
ve cac » va cac, vien cac

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 ((ty dang) or (ty hang)) cau hoa. hieu ve cac nuoc va ((hanh tai) or (thanh tai)) duc tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ty dang) OR (ty hang)) cau hoa. hieu ve cac nuoc va ((hanh tai) OR (thanh tai)) duc tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ((ty dang) or (ty hang)) cau hoa. hieu ve cac nuoc va ((hanh tai) or (thanh tai)) duc tre*.