Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
su triet » su viet, su tien, ve triet
thanh ve » hanh ve, thanh va, thanh vien
ve cham » va cham, ve chat, vu cham
so sach » so sanh, bo sach, co sach
mai hoi » mai khoi, dai hoi, lai hoi
ly nang » ky nang, ly hang, ly vang
y nang » ky nang, v nang, may nang
tu van » tu va
ve cai » va cai, ve cac, ve tai
ve su » va su

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ((y nang) OR (ly nang)) mai hoi. hieu ((ve cai) or (ve cham)) tu van thanh ve su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ((y nang) OR (ly nang)) mai hoi. hieu ((ve cai) OR (ve cham)) tu van thanh ve su triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ((y nang) OR (ly nang)) mai hoi. hieu ((ve cai) or (ve cham)) tu van thanh ve su triet*".