Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
van hanh » van thanh, ban hanh, van anh
te sach » toc sach
cac xuc » cam xuc, cac nuoc, chat xuc
nang ma » tang ma, sang ma, mang may
xuc van » duc van, luc van, vuc van
hieu va » lieu va, hieu qua
vi cua » vai cua, di cua
cua su » qua 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 (hoc sach)) ty ((nang ma) OR (nang cao)) hoi. hieu va cac xuc van hanh vi cua su~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (hoc sach)) ty ((nang ma) OR (nang cao)) hoi. hieu va cac xuc van hanh vi cua su.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (hoc sach)) ty ((nang ma) OR (nang cao)) hoi. hieu va cac xuc van hanh vi cua su".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (hoc sach)) ty ((nang ma) OR (nang cao)) hoi. hieu va cac xuc van hanh vi cua su*.