Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
dong hoi » dong hoc, dong hoa, dong co
dang hoi » dang khoi, dang hoai, dan hoi
cham buc » cham soc, pham duc, cham cuu
hieu van » hieu va, thien van, lieu va
van cham » van chat, van tham, va cham
sach ty » sach y, sach tu, sach thu
nang ma » tang ma, sang ma, nang cao
bo sach » co sach, hoc sach
buc xa » tuc xa

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

• Performing a fuzzy search may retrieve terms with similar spellings: bo sach ty ((nang ma) or (hang va)) hoi. hieu van cham buc xa ((dang hoi) OR (dong hoi)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: bo sach ty ((nang ma) OR (hang va)) hoi. hieu van cham buc xa ((dang hoi) OR (dong hoi)) cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "bo sach ty ((nang ma) or (hang va)) hoi. hieu van cham buc xa ((dang hoi) OR (dong hoi)) cua triet".
• Adding a wildcard symbol may retrieve word variants: bo sach ty ((nang ma) or (hang va)) hoi. hieu van cham buc xa ((dang hoi) OR (dong hoi)) cua triet*.