Perhaps you should try some spelling variations:
thanh doi » thanh loi, thanh moi, thanh do
nam thuc » nam thuoc, am thuc, nam thu
hanh doi » hanh noi, hang doi, hanh moi
hieu van » hieu va, thien van, lieu va
thuc va » thuc vat, thuc dan, thuc day
te sach » toc sach
ly nang » ky nang, ly hang, ly vang
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, v nang, may nang
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: te sach ((y nang) or (ly nang)) ma hoi. hieu van nam thuc va ((hanh doi) OR (thanh doi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((y nang) OR (ly nang)) ma hoi. hieu van nam thuc va ((hanh doi) OR (thanh doi)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((y nang) or (ly nang)) ma hoi. hieu van nam thuc va ((hanh doi) OR (thanh doi)) cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ((y nang) or (ly nang)) ma hoi. hieu van nam thuc va ((hanh doi) OR (thanh doi)) cua tre*.