Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nam thuc, nham thu
thu sach » tu sach, thuat sach, thuoc sach
minh vai » minh va, minh hai, minh ai
thuc van » thuc vat, thuc dan, thuc va
vai cua » dai cua, hai cua, lai cua
ve nham » ve nha, ve cham
hieu ve » hieu va, hieu van
dai hoi » dai hoc, dai hai, dai moi
mai hoi » mai khoi, lai hoi, mai doi
ky dang » ky nang, ky danh
ky tang » ky nang, kho tang, ky trong
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: thu sach ((ky tang) OR (ky dang)) ((mai hoi) or (dai hoi)). hieu ve nham thuc van minh vai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((ky tang) OR (ky dang)) ((mai hoi) OR (dai hoi)). hieu ve nham thuc van minh vai cua te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((ky tang) OR (ky dang)) ((mai hoi) or (dai hoi)). hieu ve nham thuc van minh vai cua te*".