Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
cai nuoc » cap nuoc, cac nuoc, cuoi nuoc
so sanh » do sanh
va danh » va dinh, va dan, va hanh
hieu ve » hieu va, hieu van
ty nang » ky nang, ty xang, ty hang
ve cai » va cai, ve cac, ve tai
di cua » dai cua, doi cua, do cua
de cua » le cua, te cua, dieu cua
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((so sanh) or (hoc sach)) ty nang x hoi. hieu ve cai nuoc va danh ((di cua) OR (de cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sanh) OR (hoc sach)) ty nang x hoi. hieu ve cai nuoc va danh ((di cua) OR (de cua)) te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sanh) or (hoc sach)) ty nang x hoi. hieu ve cai nuoc va danh ((di cua) OR (de cua)) te*".