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