Perhaps you should try some spelling variations:
hoc sac » hoc sach, hoc cac, hoc mac
hieu va » hieu qua
sac ky » cac ky, sai ky
xuc va » duc va, luc va, xac va
tuc va » thuc va, truc va, tuc xa
anh va » hanh va
va cua » va chua, via cua, ca cua
cua cu » cua chu, cua cau, cua su
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: hoc sac ky nang x hoi. ((hieu va) or (lieu va)) cam ((xuc va) OR (tuc va)) anh va cua cu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sac ky nang x hoi. ((hieu va) OR (lieu va)) cam ((xuc va) OR (tuc va)) anh va cua cu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sac ky nang x hoi. ((hieu va) or (lieu va)) cam ((xuc va) OR (tuc va)) anh va cua cu".
• Adding a wildcard symbol may retrieve word variants: hoc sac ky nang x hoi. ((hieu va) or (lieu va)) cam ((xuc va) OR (tuc va)) anh va cua cu*.