Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
sach cuu » sach cua, sach luu, sach uu
cuu nang » chuc nang, cam nang, cuu van
va dinh » van dinh, va kinh, va tinh
va danh » va dan, va hanh, dia danh
cac xuc » cam xuc, cac nuoc, chat xuc
hieu va » lieu va, hieu qua
hieu ve » hieu van
luu tre » luu tru, cuu tre, luy tre
nang o » nang co, nang ho, nang ro
vi luu » vi lua
o hoi » co hoi, o hoc, o hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach cuu nang o hoi. ((hieu ve) OR (hieu va)) cac xuc ((va danh) or (va dinh)) vi luu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach cuu nang o hoi. ((hieu ve) OR (hieu va)) cac xuc ((va danh) OR (va dinh)) vi luu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach cuu nang o hoi. ((hieu ve) OR (hieu va)) cac xuc ((va danh) or (va dinh)) vi luu tre".
• Adding a wildcard symbol may retrieve word variants: thu sach cuu nang o hoi. ((hieu ve) OR (hieu va)) cac xuc ((va danh) or (va dinh)) vi luu tre*.