Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
te sach » toc sach
vai cua » dai cua, hai cua, lai cua
va danh » va dinh, va dan, va hanh
cac hoc » cach hoc, cac hop, bac hoc
hieu ve » hieu va, hieu van
may hoi » may thoi, tay hoi, mai hoi
ky mang » ky nang, ke mang, ky dang
ve cac » va cac, vien cac
vi cua » di cua

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 (thuat sach)) ky mang may hoi. hieu ve cac hoc va danh ((vi cua) OR (vai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (thuat sach)) ky mang may hoi. hieu ve cac hoc va danh ((vi cua) OR (vai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (thuat sach)) ky mang may hoi. hieu ve cac hoc va danh ((vi cua) OR (vai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (thuat sach)) ky mang may hoi. hieu ve cac hoc va danh ((vi cua) OR (vai cua)) tre*.