Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
bac hoc » bai hoc, bac ho
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
va bac » van bac, va cac, va bai
vi cua » vai cua, di cua

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) or (tu cac)) ky lang xa hoi. hieu va bac hoc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (tu cac)) ky lang xa hoi. hieu va bac hoc va hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (tu cac)) ky lang xa hoi. hieu va bac hoc va hanh vi cua tre*.