Perhaps you should try some spelling variations:
hanh dang » hanh dong, anh dang, hanh dung
su triet » su viet, su tien, ve triet
thi hang » thi hanh, thi nang, thi hong
thuc dan » thuc hanh, hoc dan, thuc vat
thuc va » thuc vat, thuc day
tu sach » thu sach, su sach, tu cach
hieu ve » hieu va, hieu van
hang xa » hoang xa, hang va, hang ca
te sach » toc sach
ve cam » ve cham, ve cac, va cam

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) or (te sach)) thi hang xa hoi. hieu ve cam ((thuc va) OR (thuc dan)) hanh dang su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) thi hang xa hoi. hieu ve cam ((thuc va) OR (thuc dan)) hanh dang su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (te sach)) thi hang xa hoi. hieu ve cam ((thuc va) OR (thuc dan)) hanh dang su triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) thi hang xa hoi. hieu ve cam ((thuc va) OR (thuc dan)) hanh dang su triet*.