Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
va thanh » gia thanh, ban thanh, va tinh
mai khoa » tai khoa, may khoa, dai khoa
tu sach » thu sach, su sach, te sach
tai cuu » tai cuc, tai buu, tai cua
cuu tre » cua tre, cau tren, cau treo
sach ky » sac ky, sach y, sach ty
mai hoi » mai khoi, dai hoi, lai hoi
va cam » va cham, va cac, va cao
luc va » duc va, tuc va, loc va
ve cam » ve cham, ve cac, ve cai

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky nang ((mai hoi) or (mai khoa)). hieu ((ve cam) or (va cam)) luc va thanh tai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((mai hoi) OR (mai khoa)). hieu ((ve cam) OR (va cam)) luc va thanh tai cuu tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((mai hoi) or (mai khoa)). hieu ((ve cam) or (va cam)) luc va thanh tai cuu tre*.