Perhaps you should try some spelling variations:
dan thanh » dang thanh, danh thanh, ban thanh
dan nhanh » dan hanh, dan khanh, day nhanh
cham hoc » cham soc, chat hoc, cham hoi
su sach » so sach, vu sach
thi cuc » tai cuc
sach ty » sach y, sach tu, sach thu
hieu va » lieu va, hieu qua
hieu ve » hieu van
xang xa » lang xa, mang xa, ang xa
cuc te » cua te, cuc thue, cuc tieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ty xang xa hoi. ((hieu ve) or (hieu va)) cham hoc ((dan nhanh) OR (dan thanh)) thi cuc te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty xang xa hoi. ((hieu ve) OR (hieu va)) cham hoc ((dan nhanh) OR (dan thanh)) thi cuc te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty xang xa hoi. ((hieu ve) or (hieu va)) cham hoc ((dan nhanh) OR (dan thanh)) thi cuc te*".