Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
manh hai » lanh hai, minh hai, thanh hai
trung va » truong va, trang va, trung ha
van hoc » van hoa
hai cua » thai cua, dai cua, hoi cua
va manh » van manh, va danh, va hanh
van cac » van hac, van cau, van bac
ky dang » ky nang, ky danh
ky lang » ky nang, ky tang, tay lang
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: thu sach ((ky lang) OR (ky dang)) xa hoi. hieu ((van cac) or (van hoc)) trung va manh hai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((ky lang) OR (ky dang)) xa hoi. hieu ((van cac) OR (van hoc)) trung va manh hai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((ky lang) OR (ky dang)) xa hoi. hieu ((van cac) or (van hoc)) trung va manh hai cua te".
• Adding a wildcard symbol may retrieve word variants: thu sach ((ky lang) OR (ky dang)) xa hoi. hieu ((van cac) or (van hoc)) trung va manh hai cua te*.