Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
hanh tai » hang tai, han tai, hinh tai
su sach » so sach, vu sach
sach ly » sach y, sach lo, sach ty
cua tre » cua te, cua triet, dua tren
hieu ve » hieu va, hieu van
hang ca » hang va, nang cao, hang tai
ly hang » ly quang
cuu tre » cau tren, cau treo
cac tu » cac thu, cach tu, cac du
ve cac » va cac, vien cac
ca hoi » cau hoi, cua hoi, xa hoi

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 ly hang ca hoi. hieu ve cac tu va ((hanh tai) OR (thanh tai)) ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ly hang ca hoi. hieu ve cac tu va ((hanh tai) OR (thanh tai)) ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ly hang ca hoi. hieu ve cac tu va ((hanh tai) OR (thanh tai)) ((cua tre) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: su sach ly hang ca hoi. hieu ve cac tu va ((hanh tai) OR (thanh tai)) ((cua tre) or (cuu tre))*.