Perhaps you should try some spelling variations:
thanh hoa » thanh pho
cam thuc » am thuc, nam thuc, cam thu
thanh ha » thanh hai, nhanh ha, thanh phan
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
thuc va » thuc vat, thuc dan, thuc day
van cam » van nam, van lam, van cau
va nang » van nang, da nang, cam nang
cua tre » cua te, cuu tre, cua triet
v nang » vu nang, van nang, voi nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ((v nang) or (va nang)) xa hoi. hieu van cam thuc va ((thanh ha) OR (thanh hoa)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((v nang) OR (va nang)) xa hoi. hieu van cam thuc va ((thanh ha) OR (thanh hoa)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((v nang) or (va nang)) xa hoi. hieu van cam thuc va ((thanh ha) OR (thanh hoa)) cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ((v nang) or (va nang)) xa hoi. hieu van cam thuc va ((thanh ha) OR (thanh hoa)) cua tre*.