Perhaps you should try some spelling variations:
cham hoc » cham soc, chat hoc, cham hoi
cau tren » cu tren, dau tren, ca tren
tu sach » thu sach, su sach, te sach
lang xa » lang ha, dang xay, lang van
hieu vu » hieu va, hieu ve, hieu su
vu cham » va cham, vu kham, tu cham
va hanh » van hanh, va thanh, va danh
cuu tre » cua tre, cau treo
y lang » o lang, _ lang, tay lang

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y lang xa hoi. hieu vu cham hoc va hanh vi ((cuu tre) OR (cau tren))~".
• Adding a wildcard symbol may retrieve word variants: tu sach y lang xa hoi. hieu vu cham hoc va hanh vi ((cuu tre) OR (cau tren))*.