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