Perhaps you should try some spelling variations:
dan nhanh » dan hanh, dan khanh, dan thanh
cham hoc » cham soc, cham hoi, cho hoc
nhanh vi » hanh vi, nhanh va, nhanh thi
chat hoc » chat hoa, chat thom, cho hoc
tu sach » thu sach, su sach, te sach
hieu vu » hieu ve, hieu su, dieu vu
hieu va » lieu va, hieu qua
xang xa » lang xa, mang xa, ang xa
y xang » ty xang
vi cua » vai cua, di cua
cua te » cua tu

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 xang xa hoi. ((hieu vu) or (hieu va)) ((cham hoc) OR (chat hoc)) dan nhanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y xang xa hoi. ((hieu vu) OR (hieu va)) ((cham hoc) OR (chat hoc)) dan nhanh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y xang xa hoi. ((hieu vu) or (hieu va)) ((cham hoc) OR (chat hoc)) dan nhanh vi cua te".
• Adding a wildcard symbol may retrieve word variants: tu sach y xang xa hoi. ((hieu vu) or (hieu va)) ((cham hoc) OR (chat hoc)) dan nhanh vi cua te*.