Perhaps you should try some spelling variations:
thuc dan » thuc hanh, hoc dan, thuc vat
vanh dai » van dai, vanh tai, lanh dao
tu sach » thu sach, su sach, te sach
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
thuc va » thuc vat, thuc day
cua tre » cua te, cuu tre, cua triet
y lang » o lang, _ lang, tay lang
va nam » van nam, ha nam, va nay

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 lang xa hoi. hieu va nam ((thuc va) OR (thuc dan)) vanh dai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y lang xa hoi. hieu va nam ((thuc va) OR (thuc dan)) vanh dai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach y lang xa hoi. hieu va nam ((thuc va) OR (thuc dan)) vanh dai cua tre*.