Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
nhan tai » hang tai, van tai, toan tai
hieu va » lieu va, hieu qua
cam tuc » cam tu, nam thuc, dam thuc
xa nhan » ca nhan, va nhan, xa phan
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, ma hoa, me hoi
cuc te » cua te, cuc thue, cuc tieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sach y nang ((ma hoi) OR (xa hoi)). hieu va ((cam tuc) or (cam xuc)) xa nhan tai cuc te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach y nang ((ma hoi) OR (xa hoi)). hieu va ((cam tuc) OR (cam xuc)) xa nhan tai cuc te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach y nang ((ma hoi) OR (xa hoi)). hieu va ((cam tuc) or (cam xuc)) xa nhan tai cuc te".
• Adding a wildcard symbol may retrieve word variants: thuoc sach y nang ((ma hoi) OR (xa hoi)). hieu va ((cam tuc) or (cam xuc)) xa nhan tai cuc te*.