Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
lang van » dang van, tang van, hoang van
manh hai » lanh hai, minh hai, thanh hai
sach nay » sach hay, sach vay, sach nang
va triet » va thiet, va trien, ve triet
lang xa » lang ha, dang xay
va manh » van manh, va danh, va hanh
ve cac » va cac, vien cac
va cam » va cham, va cac, va cao
xuc va » duc va, tuc va, luc va
hai va » hai van, thai va, hoi 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 nay ((lang xa) OR (lang van)) hoi. hieu ((ve cac) or (va cam)) xuc va manh hai va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach nay ((lang xa) OR (lang van)) hoi. hieu ((ve cac) OR (va cam)) xuc va manh hai va triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach nay ((lang xa) OR (lang van)) hoi. hieu ((ve cac) or (va cam)) xuc va manh hai va triet*".