Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh le » thinh le, thanh ve, thanh de
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
duc ban » duc tan, duc van, dua ban
le phat » te phat, de phat, le nhat
nang ro » nang co, nang ho, nang ra
va cam » va cham, va cac, va cao
ve cam » ve cham, ve cac, ve cau
ro hoi » co hoi, o hoi, mo hoi
ve cai » va cai, ve cac, ve tai

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ky nang ro hoi. hieu ((((ve cam) or (ve cai))) or (va cam)) duc ban thanh le phat trien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang ro hoi. hieu ((((ve cam) OR (ve cai))) OR (va cam)) duc ban thanh le phat trien.
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang ro hoi. hieu ((((ve cam) or (ve cai))) or (va cam)) duc ban thanh le phat trien*.