Perhaps you should try some spelling variations:
nang chung » bang chung, nang thuong, dang hung
chung hoc » trung hoc, dung hoc, hung hoa
toc sach » hoc sach, doc sach, thuoc sach
van hanh » van thanh, ban hanh, van anh
luc van » luoc van, luu van, duc van
lai cua » dai cua, hai cua, lai chau
vai cua » dai cua, hai cua, bai cua
hieu va » lieu va, hieu qua
cac luc » cau luc, coc luc, cac nuoc
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) OR (toc sach)) ty nang chung hoc. hieu va cac luc van hanh ((vai cua) or (lai cua)) cay~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ty nang chung hoc. hieu va cac luc van hanh ((vai cua) OR (lai cua)) cay*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) ty nang chung hoc. hieu va cac luc van hanh ((vai cua) or (lai cua)) cay*".