Perhaps you should try some spelling variations:
thac toc » cac toc, thac cac, thi toc
sach ky » sac ky, sach y, sach ty
va danh » va dinh, va dan, va hanh
su sach » so sach, vu sach
hac tuc » thai tuc
hieu va » lieu va, hieu qua
vi cuu » vinh cuu
vi luu » vi lua
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky nang x hoi. hieu va ((hac tuc) OR (thac toc)) va danh ((vi cuu) or (vi luu)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang x hoi. hieu va ((hac tuc) OR (thac toc)) va danh ((vi cuu) OR (vi luu)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang x hoi. hieu va ((hac tuc) OR (thac toc)) va danh ((vi cuu) or (vi luu)) tre".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang x hoi. hieu va ((hac tuc) OR (thac toc)) va danh ((vi cuu) or (vi luu)) tre*.