Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac
cau treo » cau theo, cau tren, cau triet
toc sac » toc sach, toc san, doc sach
hoc anh » hoc nganh, hoc nhanh, ngoc anh
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
va danh » va dinh, va dan, va hanh
danh vi » hanh vi, dinh vi, danh di
ve cau » ke cau, va cau, ve cac
vi cau » va cau, di cau, viet cau

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((toc sac) or (((hoc sach) OR (hoc anh)))) ky nang xa hoi. hieu ve cau tao va danh vi cau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sac) OR (((hoc sach) OR (hoc anh)))) ky nang xa hoi. hieu ve cau tao va danh vi cau treo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sac) or (((hoc sach) OR (hoc anh)))) ky nang xa hoi. hieu ve cau tao va danh vi cau treo".
• Adding a wildcard symbol may retrieve word variants: ((toc sac) or (((hoc sach) OR (hoc anh)))) ky nang xa hoi. hieu ve cau tao va danh vi cau treo*.