Perhaps you should try some spelling variations:
phat hien » phat trien
thanh le » thinh le, thanh ve, thanh de
va thanh » gia thanh, ban thanh, va tinh
sach ky » sac ky, sach y, sach ty
le phat » te phat, de phat, le nhat
vu sach » vu bach, su sach, vu khach
ve cham » va cham, ve chat, vu cham
va cam » va cham, va cac, va cao
ve cau » ke cau, va cau, ve cac
luc va » duc va, tuc va, loc va
nang o » nang co, nang ho, nang ro
o hoi » co hoi, o hoc, o hai

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 o hoi. hieu ((((ve cau) or (ve cham))) or (va cam)) luc va thanh le phat hien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang o hoi. hieu ((((ve cau) OR (ve cham))) OR (va cam)) luc va thanh le phat hien.
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang o hoi. hieu ((((ve cau) or (ve cham))) or (va cam)) luc va thanh le phat hien*.