Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
van cam » van nam, van cau, van dam
van lam » van nam
benh vi » benh va, benh ve, benh li
cua tre » cua te, cuu tre, cua triet
duc ba » duc ban, duc bao, duc ha
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 ky nang xa hoi. hieu ((van cam) OR (van lam)) ((duc ba) or (duc va)) benh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. hieu ((van cam) OR (van lam)) ((duc ba) OR (duc va)) benh vi cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang xa hoi. hieu ((van cam) OR (van lam)) ((duc ba) or (duc va)) benh vi cua tre*".