Perhaps you should try some spelling variations:
cua triet » cua viet, va triet
su triet » su viet, su tien, ve triet
cham duc » pham duc, cham soc, pham duy
tang mai » tang ma, tang tai, lang mai
van hanh » van thanh, ban hanh, van anh
hanh va » hang va, hanh vi
duc van » duc va, duc tan, duc manh
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
tieu su » thieu so
hieu su » hieu sau, hieu so, hieu suat
mai hoi » mai khoi, dai hoi, lai hoi
ty tang » tay tang, ty xang, ty hang

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 ty tang mai hoi. ((hieu su) or (tieu su)) cham duc van hanh va ((cua triet) OR (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty tang mai hoi. ((hieu su) OR (tieu su)) cham duc van hanh va ((cua triet) OR (su triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty tang mai hoi. ((hieu su) or (tieu su)) cham duc van hanh va ((cua triet) OR (su triet))".
• Adding a wildcard symbol may retrieve word variants: tu sach ty tang mai hoi. ((hieu su) or (tieu su)) cham duc van hanh va ((cua triet) OR (su triet))*.