Perhaps you should try some spelling variations:
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
hanh de » hanh ve, hanh kem
hanh di » hanh vi, hang di, danh di
dao tuc » dao duc
cau tre » cau tren, cau treo, cau tra
dau tuc » dau tu, cau truc, dau nuoc
nang ma » tang ma, sang ma, nang cao
ty nang » ky nang, ty xang, ty hang
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ty nang ma hoi. lieu va ((dau tuc) or (dao tuc)) van ((hanh di) OR (hanh de)) cau tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang ma hoi. lieu va ((dau tuc) OR (dao tuc)) van ((hanh di) OR (hanh de)) cau tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty nang ma hoi. lieu va ((dau tuc) or (dao tuc)) van ((hanh di) OR (hanh de)) cau tre*".