Perhaps you should try some spelling variations:
xanh hanh » danh thanh, ban hanh, van hanh
duc xanh » duc anh, duc manh, duc hanh
tu sach » thu sach, su sach, te sach
sach va » sach xa, sach ha, sach dao
va nang » van nang, da nang, cam nang
nang ma » tang ma, sang ma, nang cao
ve cham » va cham, ve chat, vu cham
su viet » so viet
ve cam » ve cac, va cam, ve cai
vi su » va su, ve su, ki su

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 va nang ma hoa. hieu ((ve cam) or (ve cham)) duc xanh hanh vi su viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach va nang ma hoa. hieu ((ve cam) OR (ve cham)) duc xanh hanh vi su viet*.