Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
dang xay » dang van, van xay
cao nuoc » cap nuoc, cao ngoc, cao quoc
so sach » so sanh, bo sach, co sach
danh di » danh du, xanh di, danh dien
va danh » va dinh, va dan, va hanh
hieu va » lieu va, hieu qua
xay hoi » xa hoi, tay hoi, cay phoi
ty dang » ty xang, ky dang, ty hang
di cua » dai cua, doi cua, de 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: ((so sach) or (hoc sach)) ty dang xay hoi. hieu va ((cao nuoc) or (cac nuoc)) va danh di cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (hoc sach)) ty dang xay hoi. hieu va ((cao nuoc) OR (cac nuoc)) va danh di cua te.
• Adding a wildcard symbol may retrieve word variants: ((so sach) or (hoc sach)) ty dang xay hoi. hieu va ((cao nuoc) or (cac nuoc)) va danh di cua te*.