Perhaps you should try some spelling variations:
hoc duoc » hoc nuoc, hoa duoc, hoc dung
van hanh » van thanh, ban hanh, van anh
te sach » toc sach
noi cuu » noi cua, nhim cuu
va danh » va dinh, va hanh, dia danh
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
cuu tre » cua tre, cau tren, cau treo
y nang » ky nang, ly nang, v nang
va dan » ca dan, va dao, va dau
ve hoc » te hoc, va hoc, vi hoc

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 y nang ma hoa. hieu ve hoc duoc ((((va danh) OR (va dan))) or (van hanh)) noi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang ma hoa. hieu ve hoc duoc ((((va danh) OR (va dan))) OR (van hanh)) noi cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y nang ma hoa. hieu ve hoc duoc ((((va danh) OR (va dan))) or (van hanh)) noi cuu tre".
• Adding a wildcard symbol may retrieve word variants: te sach y nang ma hoa. hieu ve hoc duoc ((((va danh) OR (va dan))) or (van hanh)) noi cuu tre*.