Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
van hanh » ban hanh, van anh, van ban
tu sach » thu sach, su sach, te sach
ve cham » va cham, ve chat, vu cham
nang ma » tang ma, sang ma, nang cao
su viet » so viet
sach v » sach va, sach y, sach 2
ve cai » va cai, ve cac, ve tai
v nang » va nang, vu nang, van nang
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 v nang ma hoa. hieu ((ve cai) or (ve cham)) duc ((van hanh) OR (van thanh)) vi su viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach v nang ma hoa. hieu ((ve cai) OR (ve cham)) duc ((van hanh) OR (van thanh)) vi su viet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach v nang ma hoa. hieu ((ve cai) or (ve cham)) duc ((van hanh) OR (van thanh)) vi su viet*".