Perhaps you should try some spelling variations:
vanh dai » van dai, lanh dao, van dao
vanh tai » van tai, hanh tai, anh tai
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 dan, thuc day
cua tre » cua te, cuu tre, cua triet
y lang » o lang, _ lang, tay lang
cua tu » cua tuc, cua su, cua cu
va am » va lam, 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 y lang xa hoi. hieu va am thuc va ((vanh dai) OR (vanh tai)) ((cua tre) or (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y lang xa hoi. hieu va am thuc va ((vanh dai) OR (vanh tai)) ((cua tre) OR (cua tu)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y lang xa hoi. hieu va am thuc va ((vanh dai) OR (vanh tai)) ((cua tre) or (cua tu))".
• Adding a wildcard symbol may retrieve word variants: tu sach y lang xa hoi. hieu va am thuc va ((vanh dai) OR (vanh tai)) ((cua tre) or (cua tu))*.