Perhaps you should try some spelling variations:
chat loc » chat hoc, chat doc, chat long
dang xay » dang van, van xay
van hanh » van thanh, ban hanh, van anh
cua tre » cua te, cua triet, dua tren
loc van » luoc van, hoc van, lo van
tu sach » thu sach, su sach, te sach
hieu va » lieu va
xay hoi » xa hoi, tay hoi, cay phoi
cuu tre » cau tren, cau treo
sach 2 » sach y
2 dang » 2 danh, _ dang, b dang

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 2 dang xay hoi. ((hieu va) OR (hieu qua)) chat loc van hanh vi ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach 2 dang xay hoi. ((hieu va) OR (hieu qua)) chat loc van hanh vi ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach 2 dang xay hoi. ((hieu va) OR (hieu qua)) chat loc van hanh vi ((cua tre) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: tu sach 2 dang xay hoi. ((hieu va) OR (hieu qua)) chat loc van hanh vi ((cua tre) or (cuu tre))*.