Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
toc sach » hoc sach, doc sach, thuoc sach
van hanh » van thanh, ban hanh, van anh
nang hoc » nang doc, nang luc, dong hoc
cac vuc » cac nuoc, cac vung, cac cuoc
vai cua » hai cua, lai cua, bai cua
vuc van » duc van, luc van, thuc van
van cac » van hac, van cau, van bac
hoc hoc » hoc hoa, toc hoc, hoc hoi
v nang » va nang, vu nang, van nang

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)) v nang hoc hoc. hieu van cac vuc van hanh ((vai cua) or (dai cua)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) v nang hoc hoc. hieu van cac vuc van hanh ((vai cua) OR (dai cua)) cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) v nang hoc hoc. hieu van cac vuc van hanh ((vai cua) or (dai cua)) cau*".