Perhaps you should try some spelling variations:
hanh va » hang va, hanh vi
va hanh » van hanh, va thanh, va danh
cac xuc » cam xuc, cac nuoc, chat xuc
hieu va » lieu va, hieu qua
sach tu » sach thu, cach tu, sach uu
hieu ve » hieu van
nang ma » tang ma, sang ma, nang cao
sach ty » sach y, sach thu, xach tay
ma hoi » mai hoi, xa hoi, ma hoa
xuc va » duc va, tuc va, luc va
va cua » va chua, via cua, ca cua
cua tu » cua tuc, cua su, cua cu

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