Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
dau tren » dau tien, dat tren, dau tieng
danh di » danh du, xanh di, danh dien
va danh » va dinh, va dan, va hanh
cac toi » cac thoi
cac toc » cac nuoc, cac thoi
te sach » toc sach
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa
di dau » doi dau, bi dau, di du

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) or (cac toi)) va danh di dau 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) OR (cac toi)) va danh di dau tren.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (thuat sach)) ky nang ma hoi. hieu ve ((cac toc) or (cac toi)) va danh di dau tren*.