Perhaps you should try some spelling variations:
chet duoc » che duoc, cho duoc, che quoc
duoc van » duoc va, duc van, duoc ban
van hanh » van thanh, ban hanh, van anh
hanh lam » thanh lap, hanh kem, hanh va
va triet » va thiet, ve triet, cua triet
va trien » va truyen, va thiet, va tuyen
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va chet » va chiet, va che, va chat

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ty nang xa hoi. hieu va chet duoc van hanh lam ((va triet) or (va trien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang xa hoi. hieu va chet duoc van hanh lam ((va triet) OR (va trien)).
• Adding a wildcard symbol may retrieve word variants: su sach ty nang xa hoi. hieu va chet duoc van hanh lam ((va triet) or (va trien))*.