Perhaps you should try some spelling variations:
cham hoc » cham soc, chat hoc, cham hoi
tu sach » thu sach, su sach, te sach
lang xa » lang ha, dang xay, lang van
hieu vu » hieu va, hieu su, dieu vu
hieu ve » hieu va, hieu van
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
y lang » o lang, _ lang, tay lang
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 y lang xa hoi. ((hieu vu) OR (hieu ve)) cham hoc va hanh vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y lang xa hoi. ((hieu vu) OR (hieu ve)) cham hoc va hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach y lang xa hoi. ((hieu vu) OR (hieu ve)) cham hoc va hanh vi cua tre*.