Perhaps you should try some spelling variations:
thanh dat » thanh san, thanh hai, thanh van
hieu van » hieu va, thien van, lieu va
cam thuc » am thuc, nam thuc, cam thu
va thanh » gia thanh, ban thanh, va tinh
tu sach » thu sach, su sach, te sach
van cam » van nam, van lam, van cau
thuc va » thuc vat, thuc dan, thuc day
dat cua » dai cua, day cua, mat cua
cua tre » cua te, cuu tre, cua triet
y lang » o lang, tay lang, yen lang
_ lang » o lang, _ land

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) or (_ lang)) xa hoi. hieu van cam thuc va thanh dat cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((y lang) OR (_ lang)) xa hoi. hieu van cam thuc va thanh dat cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ((y lang) or (_ lang)) xa hoi. hieu van cam thuc va thanh dat cua tre*.