Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
mai khoi » mai khoa, tai khoa, dai khoa
cac khoi » cac thoi, cac khoan, cach thoi
hanh tai » hang tai, han tai, hinh tai
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
ky lang » ky nang, ky dang, ky tang
sach ky » sac ky, sach y, sach ty
cuu tre » cua tre, cau tren, cau treo
xuc va » duc va, tuc va, luc va
ve cam » ve cham, ve cac, va cam

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 ky lang ((mai khoi) or (cac khoi)). hieu ve cam xuc va ((hanh tai) OR (thanh tai)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky lang ((mai khoi) OR (cac khoi)). hieu ve cam xuc va ((hanh tai) OR (thanh tai)) cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky lang ((mai khoi) or (cac khoi)). hieu ve cam xuc va ((hanh tai) OR (thanh tai)) cuu tre".
• Adding a wildcard symbol may retrieve word variants: su sach ky lang ((mai khoi) or (cac khoi)). hieu ve cam xuc va ((hanh tai) OR (thanh tai)) cuu tre*.