Perhaps you should try some spelling variations:
thieu hanh » thien thanh, thien chanh, thieu khang
thuc dan » thuc hanh, hoc dan, thuc vat
tu sach » thu sach, su sach, te sach
thuc va » thuc vat, thuc day
hieu ve » hieu va, hieu van
hanh xa » hanh va, hanh ma, hanh xu
ve nam » he nam, va nam, le nam
lam va » nam va, dam va, lam ha
nam ha » nam a, nam va, nam da

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