Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
van hanh » van thanh, ban hanh, van anh
te sach » toc sach
xuc van » duc van, luc van, vuc van
cac xuc » cam xuc, cac nuoc, chat xuc
hieu va » lieu va, hieu qua
sang ma » tang ma, sang tao, mang may
nang ma » tang ma, nang cao, mang may
vi cua » vai cua, di cua
cua cu » cua chu, cua cau, cua su

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