Perhaps you should try some spelling variations:
su sach » so sach
tinh va » tich va, trinh van, trinh vat
va tinh » may tinh
coc tuc » coc luc, hoc thuc, doc thuc
hieu va » lieu va, hieu qua
hieu ve » hieu van
cuu tre » cua tre, cau tren, cau treo
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
vu sach » vu bach, vu khach
tuc va » thuc va, truc va, tuc xa
va cuu » va cau, va chu, va huu

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) OR (vu sach)) ky lang xa hoi. ((hieu ve) or (hieu va)) coc tuc va tinh va cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) ky lang xa hoi. ((hieu ve) OR (hieu va)) coc tuc va tinh va cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (vu sach)) ky lang xa hoi. ((hieu ve) or (hieu va)) coc tuc va tinh va cuu tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (vu sach)) ky lang xa hoi. ((hieu ve) or (hieu va)) coc tuc va tinh va cuu tre*.