Perhaps you should try some spelling variations:
ve triet » va trien, su triet
van hanh » van thanh, ban hanh, van anh
hoc sach » hoc sinh, hoc cac, hoc anh
cham duc » pham duc, cham soc, pham duy
qua cham » qua hai, qua cac, va cham
duc van » duc va, duc tan, duc manh
su sach » so sach, vu sach
nang xa » nang x, lang xa, mang xa
nang ma » tang ma, sang ma, nang cao
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: ((su sach) or (hoc sach)) v ((nang xa) OR (nang ma)) hoi. hieu qua cham duc van hanh vi ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (hoc sach)) v ((nang xa) OR (nang ma)) hoi. hieu qua cham duc van hanh vi ve triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (hoc sach)) v ((nang xa) OR (nang ma)) hoi. hieu qua cham duc van hanh vi ve triet*".