Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
te sach » toc sach
danh du » danh dau, danh tu, dinh du
danh di » xanh di, danh dien, danh gia
cac toc » cac toi, cac nuoc, cac thoi
cu tren » tu tren, dua tren
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa
toc va » hoc va, toc ta, tuc va
ve cac » va cac, vien cac

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