Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
cham cuu » cap cuu, chat cua
van hanh » van thanh, ban hanh, van anh
hanh tai » thanh tai, hang tai, han tai
sach ty » sach y, sach tu, xach tay
tai cua » thai cua, tai cuc, tri cua
cua tu » cua tuc, cua su, cua cu
x hoi » xa hoi, o hoi, x ho

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 ty) OR (sach thu)) nang x hoi. ((lieu va) or (hieu qua)) cham cuu van hanh tai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ty) OR (sach thu)) nang x hoi. ((lieu va) OR (hieu qua)) cham cuu van hanh tai cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ty) OR (sach thu)) nang x hoi. ((lieu va) or (hieu qua)) cham cuu van hanh tai cua tu".
• Adding a wildcard symbol may retrieve word variants: te ((sach ty) OR (sach thu)) nang x hoi. ((lieu va) or (hieu qua)) cham cuu van hanh tai cua tu*.