Perhaps you should try some spelling variations:
sach ky » sach y, sach ty, sach kem
hieu ve » hieu va, hieu van
cam luc » cam xuc, cau luc
va danh » va dinh, va dan, va hanh
danh va » doanh va, hanh va, anh va
cua tre » cua te, cuu tre, cua triet
sac ky » cac ky, sai ky
ve cam » ve cham, ve cac, va cam
luc va » duc va, tuc va, loc va
va cua » va chua, via cua, ca cua
x hoi » xa hoi, o hoi, 5 hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat ((sach ky) OR (sac ky)) nang ((x hoi) or (x ho)). hieu ve cam luc va danh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat ((sach ky) OR (sac ky)) nang ((x hoi) OR (x ho)). hieu ve cam luc va danh va cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat ((sach ky) OR (sac ky)) nang ((x hoi) or (x ho)). hieu ve cam luc va danh va cua tre*".