Perhaps you should try some spelling variations:
thanh hoa » thanh pho
thanh hai » thanh phan, thanh san
cam thuc » am thuc, nam thuc, cam thu
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
da nang » cam nang, kha nang, cao nang
v nang » va nang, vu nang, van nang
cua te » cua tu

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