Perhaps you should try some spelling variations:
thanh dat » thanh san, thanh hai, thanh van
va triet » va thiet, va trien, ve triet
thi hanh » thi thanh
thuc van » thuc vat, thuc dan, thuc va
sach thi » sach thu, sach tai, sach thieu
tuc van » truc van, tuc va, duc van
tu sach » thu sach, su sach, te sach
hieu ve » hieu van
hanh xa » hanh va, hanh ma, hanh xu
hieu va » lieu va, hieu qua

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 thi hanh xa hoi. ((hieu ve) or (hieu va)) cam ((tuc van) OR (thuc van)) thanh dat va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thi hanh xa hoi. ((hieu ve) OR (hieu va)) cam ((tuc van) OR (thuc van)) thanh dat va triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach thi hanh xa hoi. ((hieu ve) or (hieu va)) cam ((tuc van) OR (thuc van)) thanh dat va triet*".