Perhaps you should try some spelling variations:
kho tang » cao tang
toc sach » hoc sach, doc sach, thuoc sach
ban hanh » ban hang
va trien » va truyen, va thiet, va tuyen
ky tang » ky nang, ky dang, ky trong
qua cam » qua cham, qua cac, qua ca
xuc ban » duc ban, cuc ban, quoc ban
kem va » kiem va, kiem van

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) or (toc sach)) ((ky tang) OR (kho tang)) xa hoi. hieu qua cam xuc ban hanh kem va trien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ((ky tang) OR (kho tang)) xa hoi. hieu qua cam xuc ban hanh kem va trien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (toc sach)) ((ky tang) OR (kho tang)) xa hoi. hieu qua cam xuc ban hanh kem va trien".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) ((ky tang) OR (kho tang)) xa hoi. hieu qua cam xuc ban hanh kem va trien*.