Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
nam thuc » nam thuoc, am thuc, nam thu
thuc van » thuc vat, thuc dan, thuc va
hanh dai » hanh tai, vanh dai, thanh dat
hanh dao » lanh dao, thanh dat, thanh dam
cua viet » ca viet, hoa viet, cua vat
tu sach » thu sach, su sach, te sach
sach lo » sach dao, sach doi, sach hoi
lo tang » le tang, do tang, lo tan
tang ma » mang may, tang van
ma hoi » mai hoi, xa hoi, ma hoa

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 lo tang ma hoi. hieu van nam thuc van ((hanh dai) OR (hanh dao)) cua viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach lo tang ma hoi. hieu van nam thuc van ((hanh dai) OR (hanh dao)) cua viet".
• Adding a wildcard symbol may retrieve word variants: tu sach lo tang ma hoi. hieu van nam thuc van ((hanh dai) OR (hanh dao)) cua viet*.