Perhaps you should try some spelling variations:
sach thue » sach thieu, sach tham, cach thuc
van hanh » van thanh, ban hanh, van anh
cham xuc » cam xuc, chat xuc, cham soc
sach thu » sach thieu, sach tham, cach thuc
va cham » va chat, va tham
hanh va » hang va, hanh vi
xuc van » duc van, luc van, vuc van
hieu va » lieu va, hieu qua
van hoe » van hoc, van hieu, van hien
va cua » va chua, via cua, ca cua
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: so ((sach thu) OR (sach thue)) tang ((van hoe) or (van hoa)). hieu va cham xuc van hanh va cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so ((sach thu) OR (sach thue)) tang ((van hoe) OR (van hoa)). hieu va cham xuc van hanh va cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so ((sach thu) OR (sach thue)) tang ((van hoe) or (van hoa)). hieu va cham xuc van hanh va cua te".
• Adding a wildcard symbol may retrieve word variants: so ((sach thu) OR (sach thue)) tang ((van hoe) or (van hoa)). hieu va cham xuc van hanh va cua te*.