Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
van phan » van phong, van thanh, luan phan
va cham » va chat, va tham
lap cua » lai cua, tap cua, lam cua
va phan » va phat, va phap, hoa phan
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
vu cham » vu kham, tu cham, qua cham
nang ho » nang hoc, nang co, tang ho
ty nang » ky nang, ty xang, ty hang
ho hoi » hoc hoi, hoa hoi, hoi hoi

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 ty nang ho hoi. hieu ((vu cham) OR (va cham)) truc ((va phan) or (van phan)) lap cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang ho hoi. hieu ((vu cham) OR (va cham)) truc ((va phan) OR (van phan)) lap cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang ho hoi. hieu ((vu cham) OR (va cham)) truc ((va phan) or (van phan)) lap cua triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang ho hoi. hieu ((vu cham) OR (va cham)) truc ((va phan) or (van phan)) lap cua triet*.