Perhaps you should try some spelling variations:
su sach » so sach
vu sach » vu bach, vu khach
doc hoi » duoc hoi, doc hai, doi hoi
hoc hoi » hoc khoi, hoc hoa, hoc noi
qua cao » qua cac, qua ca, qua cai
va hanh » van hanh, va thanh, va danh
cuu tre » cua tre, cau tren, cau treo
cao tu » cao thu, co tu, cao su
vi cuu » vi luu, vinh cuu

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 (vu sach)) ky nang ((doc hoi) OR (hoc hoi)). hieu qua cao tu va hanh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) ky nang ((doc hoi) OR (hoc hoi)). hieu qua cao tu va hanh vi cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (vu sach)) ky nang ((doc hoi) OR (hoc hoi)). hieu qua cao tu va hanh vi cuu tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu sach)) ky nang ((doc hoi) OR (hoc hoi)). hieu qua cao tu va hanh vi cuu tre*.