Perhaps you should try some spelling variations:
thuoc sach » hoc sach, thuat sach, thuoc sinh
nuoc sach » nguoi sach, hoc sach, cuoc cach
hanh dai » hanh tai, hanh dao, vanh dai
ban hanh » ban hang
hieu van » hieu va, thien van, lieu va
luc ban » duc ban, cuc ban, luc bat
van coc » van hoc, van loc, van co
lang ha » long ha
lang xa » dang xay, lang van
cua tu » cua tuc, cua su, cua cu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((thuoc sach) OR (nuoc sach)) y ((lang xa) or (lang ha)) hoi. hieu van coc luc ban hanh dai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuoc sach) OR (nuoc sach)) y ((lang xa) OR (lang ha)) hoi. hieu van coc luc ban hanh dai cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thuoc sach) OR (nuoc sach)) y ((lang xa) or (lang ha)) hoi. hieu van coc luc ban hanh dai cua tu".
• Adding a wildcard symbol may retrieve word variants: ((thuoc sach) OR (nuoc sach)) y ((lang xa) or (lang ha)) hoi. hieu van coc luc ban hanh dai cua tu*.