Perhaps you should try some spelling variations:
hanh tai » thanh tai, hang tai, han tai
su sach » so sach, vu sach
tai duc » tai cuc, mai duc, tai du
va hanh » van hanh, va thanh, va danh
hieu va » lieu va, hieu qua
cai hoa » cau hoa, cam hoa, dai hoa
sach ky » sac ky, sach y, sach ty
dai hoi » dai hoc, dai hai, dai moi
cai hoi » cau hoi, lai hoi, mai hoi
duc tre » duoc tren, duc tien
va cam » va cham, va cac, va cao
xuc va » duc va, tuc va, luc va

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