Perhaps you should try some spelling variations:
sach thi » sach thu, sach tai, sach thieu
thi hanh » thi thanh
van hanh » van thanh, ban hanh, van anh
va hanh » va thanh, va danh, ban hanh
te sach » toc sach
cam tuc » cam xuc, cam tu, nam thuc
hieu ve » hieu va, hieu van
hanh va » hang va, hanh vi
ve cam » ve cham, ve cac, va cam
va hoi » xa hoi, va hoc, va hoa
lai va » loai va, dai va, hai va

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach thi hanh va hoi. hieu ve cam tuc ((va hanh) OR (van hanh)) ((lai va) or (mai va)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach thi hanh va hoi. hieu ve cam tuc ((va hanh) OR (van hanh)) ((lai va) OR (mai va)) triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach thi hanh va hoi. hieu ve cam tuc ((va hanh) OR (van hanh)) ((lai va) or (mai va)) triet*".