Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
sach ty » sach y, sach tu, sach thu
san cuu » san cua, san huu, song cuu
su sach » so sach, vu sach
nang co » nang cao, nang doc, nang noi
hieu ve » hieu va
ty nang » ky nang, ty xang, ty hang
cuu tre » cua tre, cau tren, cau treo
co hoi » co hoc, co loi
xuc va » duc va, tuc va, xac va
luc va » duc va, tuc va, loc va

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 ty nang co hoi. ((hieu ve) OR (hieu van)) chat ((xuc va) or (luc va)) thanh san cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang co hoi. ((hieu ve) OR (hieu van)) chat ((xuc va) OR (luc va)) thanh san cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty nang co hoi. ((hieu ve) OR (hieu van)) chat ((xuc va) or (luc va)) thanh san cuu tre".
• Adding a wildcard symbol may retrieve word variants: su sach ty nang co hoi. ((hieu ve) OR (hieu van)) chat ((xuc va) or (luc va)) thanh san cuu tre*.