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
hanh di » hanh vi, hanh de, hang di
xuc van » duc van, luc van, vuc van
cac xuc » cam xuc, cac nuoc, chat xuc
hieu va » lieu va, hieu qua
tang ma » mang may, tang van
nang ma » sang ma, nang cao, mang may
di cua » dai cua, doi cua, de 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 (tang ma)) hoi. hieu va cac xuc van hanh di cua cu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (thuoc sach)) ty ((nang ma) OR (tang ma)) hoi. hieu va cac xuc van hanh di cua cu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (thuoc sach)) ty ((nang ma) OR (tang ma)) hoi. hieu va cac xuc van hanh di cua cu".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (thuoc sach)) ty ((nang ma) OR (tang ma)) hoi. hieu va cac xuc van hanh di cua cu*.