Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
quoc toan » quoc oai, quoc quan, ngoc toan
toan anh » toan hanh, tuan anh, tran anh
dua tren » dung tren
cao quoc » cac quoc, cao thuoc, han quoc
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu va, hieu van
ve cao » va cao, ve bao, ve cac
anh va » hanh va
y nang » ky nang, ly nang, v 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: thuat sach y nang ((mai hoi) or (xa hoi)). hieu ve cao quoc toan anh va ((dua tren) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach y nang ((mai hoi) OR (xa hoi)). hieu ve cao quoc toan anh va ((dua tren) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: thuat sach y nang ((mai hoi) or (xa hoi)). hieu ve cao quoc toan anh va ((dua tren) or (cua te))*.