Perhaps you should try some spelling variations:
phat loc » hau loc, nhat loi, phat lam
danh vi » hanh vi, dinh vi, danh di
va danh » va dinh, va dan, va hanh
phap lo » phap ly, phap mo, phap so
hieu va » lieu va, hieu qua
tu sach » thu sach, su sach, te sach
cay cho » cap cho, cao cho, cay co
cua tre » cua te, cuu tre, cua triet
y dang » ky dang, 2 dang, _ dang
vi cua » vai cua, di cua

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 dang ((xa hoi) or (cay cho)). hieu va ((phat loc) OR (phap lo)) va danh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y dang ((xa hoi) OR (cay cho)). hieu va ((phat loc) OR (phap lo)) va danh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y dang ((xa hoi) or (cay cho)). hieu va ((phat loc) OR (phap lo)) va danh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach y dang ((xa hoi) or (cay cho)). hieu va ((phat loc) OR (phap lo)) va danh vi cua tre*.