Perhaps you should try some spelling variations:
hanh thai » nhanh thai, hinh thai, hanh tai
thi hanh » thi thanh
van hanh » van thanh, ban hanh, van anh
thai cua » than cua, tai cuc, tri cua
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
nang xa » lang xa, nang ma, mang xa
thi van » thi lan, thi nang
xuc van » duc van, luc van, vuc van
cua tre » cua te, cuu tre, cua triet

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ky ((nang xa) OR (nang x)) hoi. ((thi van) or (thi hanh)) bac xuc van hanh thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky ((nang xa) OR (nang x)) hoi. ((thi van) OR (thi hanh)) bac xuc van hanh thai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky ((nang xa) OR (nang x)) hoi. ((thi van) or (thi hanh)) bac xuc van hanh thai cua tre".
• Adding a wildcard symbol may retrieve word variants: so sach ky ((nang xa) OR (nang x)) hoi. ((thi van) or (thi hanh)) bac xuc van hanh thai cua tre*.