Perhaps you should try some spelling variations:
hang tai » hang va, dung tai
su sach » so sach, vu sach
so sanh » do sanh
cam duc » cam xuc, pham duc, nam duoc
cao duc » dao duc, cao suc, giao duc
va hang » van hang, va nang, va lang
tai cuu » tai cuc, tai buu, tai cua
cuu tre » cua tre, cau tren, cau treo

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) or (so sanh)) ky nang x ho. hieu qua ((cam duc) OR (cao duc)) va hang tai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sanh)) ky nang x ho. hieu qua ((cam duc) OR (cao duc)) va hang tai cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (so sanh)) ky nang x ho. hieu qua ((cam duc) OR (cao duc)) va hang tai cuu tre*".