Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
cac tuc » cac toc, cac tu, cac nuoc
danh ca » dan ca, doanh cua, danh cho
va danh » va dinh, va dan, va hanh
cac tac » cac toc, cac bac, cac dac
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
san ky » sang ky, van ky, dan ky
ma hoi » mai hoi, xa hoi, ma hoa
cua te » cua tu
tu san » thu san, tu ban, tu can

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu san ky nang ma hoi. hieu va ((cac tuc) OR (cac tac)) va danh ca ((cua te) or (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu san ky nang ma hoi. hieu va ((cac tuc) OR (cac tac)) va danh ca ((cua te) OR (va triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu san ky nang ma hoi. hieu va ((cac tuc) OR (cac tac)) va danh ca ((cua te) or (va triet))".
• Adding a wildcard symbol may retrieve word variants: tu san ky nang ma hoi. hieu va ((cac tuc) OR (cac tac)) va danh ca ((cua te) or (va triet))*.