Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hieu va » lieu va, hieu qua
luu tre » luu tru, cuu tre, luy tre
cao hoi » cau hoi, co hoi, cao hoc
ty nang » ky nang, ty hang, ly nang
xuc va » duc va, tuc va, xac va
luc va » duc va, tuc va, loc va
vi luu » vi lua
va cao » va cac, va co, va dao

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 ((ty nang) or (ty xang)) cao hoi. hieu va cao ((xuc va) or (luc va)) hanh vi luu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((ty nang) OR (ty xang)) cao hoi. hieu va cao ((xuc va) OR (luc va)) hanh vi luu tre.
• Adding a wildcard symbol may retrieve word variants: thu sach ((ty nang) or (ty xang)) cao hoi. hieu va cao ((xuc va) or (luc va)) hanh vi luu tre*.