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
van hanh » van thanh, ban hanh, van anh
hanh dao » lanh dao, thanh dat, thanh dam
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
ty lang » tay lang, ty xang, ty hang
dao cua » dai cua, day cua, dan cua
cua tre » cua te, cuu tre, cua triet
ha hoi » hoa hoi, ha noi, va hoi

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 ty lang ((ha hoi) or (xa hoi)). hieu van nam thuc van hanh dao cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty lang ((ha hoi) OR (xa hoi)). hieu van nam thuc van hanh dao cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ty lang ((ha hoi) or (xa hoi)). hieu van nam thuc van hanh dao cua tre*.