Perhaps you should try some spelling variations:
toc sai » toc san, toc dai, thuoc sai
nang xa » nang x, lang xa, nang ma
de cuac » de cac
va hanh » van hanh, va thanh, va danh
sai ky » sac ky
de cua » le cua, te cua, dieu cua
dao va » dao van, tao va, do va
di va » dai va, doi va, di vat

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sai ky nang xa hoi. hieu ((de cua) or (de cuac)) dao va hanh ((di va) OR (di vao)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sai ky nang xa hoi. hieu ((de cua) OR (de cuac)) dao va hanh ((di va) OR (di vao)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sai ky nang xa hoi. hieu ((de cua) or (de cuac)) dao va hanh ((di va) OR (di vao)) triet".
• Adding a wildcard symbol may retrieve word variants: toc sai ky nang xa hoi. hieu ((de cua) or (de cuac)) dao va hanh ((di va) OR (di vao)) triet*.