Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
hanh trinh » canh tranh, hanh chinh
trinh cua » tinh cua, trinh luat, trinh quan
van hanh » van thanh, ban hanh, van anh
thi van » thi lan, thi hanh, thi nang
cam duc » cam xuc, cao duc, pham duc
duc van » duc va, duc tan, duc manh
y lang » o lang, tay lang, yen lang
_ lang » o lang, _ land
cua te » cua tu

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 lang) OR (_ lang)) xa hoi. ((thien van) or (thi van)) cam duc van hanh trinh cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ((y lang) OR (_ lang)) xa hoi. ((thien van) OR (thi van)) cam duc van hanh trinh cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ((y lang) OR (_ lang)) xa hoi. ((thien van) or (thi van)) cam duc van hanh trinh cua te".
• Adding a wildcard symbol may retrieve word variants: thuoc sach ((y lang) OR (_ lang)) xa hoi. ((thien van) or (thi van)) cam duc van hanh trinh cua te*.