Perhaps you should try some spelling variations:
hanh sinh » hanh tinh, hanh dinh, hinh sinh
sinh cuu » dinh cuu, sinh cua, sinh cau
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
thi van » thi lan, thi hanh, thi nang
hang ca » hang va, nang cao, hang tai
ty hang » ly hang, ty xang, thi hang
cuu tre » cua tre, cau tren, cau treo
xac va » tac va, ac va, bac va
tuc va » thuc va, truc va, tuc xa
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: tu sach ty hang ca hoi. ((thien van) or (thi van)) lam ((xac va) or (tuc va)) hanh sinh cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty hang ca hoi. ((thien van) OR (thi van)) lam ((xac va) OR (tuc va)) hanh sinh cuu tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ty hang ca hoi. ((thien van) or (thi van)) lam ((xac va) or (tuc va)) hanh sinh cuu tre*.