Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
ve triet » va trien, su triet
tu sach » su sach, te sach, tu cach
hieu ve » hieu va, hieu van
duc van » duc va, duc manh, duc phan
v nang » va nang, vu nang, van nang
ve cam » ve cham, ve cac, va cam
x hoi » xa hoi, o hoi, x ho
vi ve » va ve, gi ve, ve ve

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) OR (thu sach)) v nang x hoi. hieu ve cam ((duc van) or (duc tan)) hanh vi ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) v nang x hoi. hieu ve cam ((duc van) OR (duc tan)) hanh vi ve triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) v nang x hoi. hieu ve cam ((duc van) or (duc tan)) hanh vi ve triet*".