Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
thanh van » thanh san, thanh toan, thanh phan
van thanh » ban thanh, van tuan
va trien » va truyen, va thiet, va tuyen
kho tang » cao tang
hieu ve » hieu va, hieu van
cam duc » cam xuc, cao duc, pham duc
duc van » duc va, duc tan, duc manh
ky dang » ky nang, ky danh
ma hoi » mai hoi, xa hoi, me hoi
ve cam » ve cham, ve cac, va cam
van va » van vat, van van, ban va

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 ((ky dang) or (kho tang)) ((ma hoi) OR (ma hoa)). hieu ve cam duc van thanh van va trien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ((ky dang) OR (kho tang)) ((ma hoi) OR (ma hoa)). hieu ve cam duc van thanh van va trien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ((ky dang) or (kho tang)) ((ma hoi) OR (ma hoa)). hieu ve cam duc van thanh van va trien".
• Adding a wildcard symbol may retrieve word variants: thuoc sach ((ky dang) or (kho tang)) ((ma hoi) OR (ma hoa)). hieu ve cam duc van thanh van va trien*.