Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
va thanh » gia thanh, ban thanh, va tinh
va trien » va truyen, va tuyen, va tieng
qua cham » qua hai, qua cac, va cham
cham luc » cham soc, nhan luc, cham cuu
thanh vi » hanh vi, thanh va, thanh ve
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
sang ma » tang ma, nang ma, sang tao
ky sang » ky nang, ky dang, ky tang
ma hoi » mai hoi, xa hoi, ma hoa
luc va » duc va, tuc va, loc va
thiet » thieu

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 ky sang ma hoi. hieu qua cham luc va thanh vi ((cua triet) or (((va trien) OR (va thiet))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky sang ma hoi. hieu qua cham luc va thanh vi ((cua triet) OR (((va trien) OR (va thiet)))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky sang ma hoi. hieu qua cham luc va thanh vi ((cua triet) or (((va trien) OR (va thiet))))".
• Adding a wildcard symbol may retrieve word variants: su sach ky sang ma hoi. hieu qua cham luc va thanh vi ((cua triet) or (((va trien) OR (va thiet))))*.