Perhaps you should try some spelling variations:
hieu hien » bieu hien, dieu hien, chieu chien
tang man » tang van, tang ma, tang dan
hanh vai » hanh vi, hanh tai, hanh van
su sach » so sach, vu sach
cao suc » cao su
hanh va » hang va, hanh vi
cuu tre » cua tre, cau tren, cau treo
sach ky » sac ky, sach y, sach ty
cao duc » dao duc, giao duc, tao duoc
man hoi » man hoai, dan hoi, van hoi
ky tang » ky nang, ky dang, kho tang

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 tang man hoi. hieu hien ((cao duc) or (cao suc)) va ((hanh vai) or (hanh va)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky tang man hoi. hieu hien ((cao duc) OR (cao suc)) va ((hanh vai) OR (hanh va)) cuu tre.
• Adding a wildcard symbol may retrieve word variants: su sach ky tang man hoi. hieu hien ((cao duc) or (cao suc)) va ((hanh vai) or (hanh va)) cuu tre*.