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 ve, dieu vu
hieu su » hieu sau, tieu su, hieu suat
hieu so » thieu so
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 su) OR (hieu so)))) cham hoc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y lang xa hoi. ((hieu vu) OR (((hieu su) OR (hieu so)))) 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 su) OR (hieu so)))) cham hoc va hanh vi cua tre*".