Perhaps you should try some spelling variations:
chat nuoc » nhat nuoc, khat nuoc, thoat nuoc
hieu van » hieu va, thien van, lieu va
tinh lap » trinh lap, tinh lao, dinh lap
cua tre » cua te, cua triet, dua tren
va tinh » may tinh
tu sach » thu sach, su sach, te sach
hieu ve » hieu va
nang ma » tang ma, sang ma, nang cao
cuu tre » cau tren, cau treo
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach y nang ma hoi. ((hieu ve) OR (hieu van)) chat nuoc va tinh lap ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang ma hoi. ((hieu ve) OR (hieu van)) chat nuoc va tinh lap ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang ma hoi. ((hieu ve) OR (hieu van)) chat nuoc va tinh lap ((cua tre) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ma hoi. ((hieu ve) OR (hieu van)) chat nuoc va tinh lap ((cua tre) or (cuu tre))*.