Perhaps you should try some spelling variations:
su triet » su tien, ve triet
tu sach » thu sach, su sach, te sach
ban dan » ban hang, ban hanh, ban quan
dua ban » dia ban, cua ban, qua ban
sach ly » sach y, sach lo, sach ty
cam dua » ca dua, cay dua, chay dua
ly nang » ky nang, ly hang, ly vang
su viet » so viet
va cam » va cham, va cac, va cao
ma hoi » mai hoi, ma hoa, me hoi
dan vi » doan vi, don vi, dan va

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