Perhaps you should try some spelling variations:
nang chung » bang chung, nang thuong, dang hung
chung hoc » trung hoc, dung hoc, hung hoa
van hanh » van thanh, ban hanh, van anh
te sach » toc sach
lai cua » dai cua, lai chau, thai cua
hai cua » thai cua, dai cua, hoi cua
vai cua » dai cua, bai cua, mai cua
luc van » luoc van, luu van, duc van
sach ty » sach y, sach tu, sach thu
cac luc » cau luc, coc luc, cac nuoc
hieu va » lieu va, hieu qua
ty nang » ky nang, ty xang, ty hang

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 ty nang chung hoc. hieu va cac luc van hanh ((((vai cua) OR (hai cua))) or (lai cua)) cay~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty nang chung hoc. hieu va cac luc van hanh ((((vai cua) OR (hai cua))) OR (lai cua)) cay*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty nang chung hoc. hieu va cac luc van hanh ((((vai cua) OR (hai cua))) or (lai cua)) cay*".