Perhaps you should try some spelling variations:
su triet » su tien, ve triet
va cham » va chat, va tham
ban dan » ban hang, ban hanh, ban quan
duc ban » duc tan, duc van, dua ban
tu sach » thu sach, su sach, te sach
nang ma » tang ma, sang ma, nang cao
su viet » so viet
y nang » ky nang, ly nang, v nang
va cam » va cac, va cao, va cai
dan vi » doan vi, don vi, dan va
ma hoi » mai hoi, xa hoi, ma hoa

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 y nang ma hoi. lieu ((va cam) OR (va cham)) duc ban dan vi ((su triet) or (su viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang ma hoi. lieu ((va cam) OR (va cham)) duc ban dan vi ((su triet) OR (su viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang ma hoi. lieu ((va cam) OR (va cham)) duc ban dan vi ((su triet) or (su viet))".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ma hoi. lieu ((va cam) OR (va cham)) duc ban dan vi ((su triet) or (su viet))*.