Perhaps you should try some spelling variations:
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
su sach » so sach, vu sach
hieu ve » hieu van
hieu va » lieu va, hieu qua
cac xuc » cam xuc, chat xuc, cac cuoc
va danh » va dinh, va dan, va hanh
danh di » danh du, xanh di, danh dien
lua tre » cua tre, luy tre, dua tren
y nang » ky nang, ly nang, v nang
di lua » di cua, vi lua, dai luan

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 y nang x ho. ((hieu ve) or (hieu va)) ((cac xuc) OR (cac nuoc)) va danh di lua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang x ho. ((hieu ve) OR (hieu va)) ((cac xuc) OR (cac nuoc)) va danh di lua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang x ho. ((hieu ve) or (hieu va)) ((cac xuc) OR (cac nuoc)) va danh di lua tre".
• Adding a wildcard symbol may retrieve word variants: su sach y nang x ho. ((hieu ve) or (hieu va)) ((cac xuc) OR (cac nuoc)) va danh di lua tre*.