Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
ngu hanh » ngu anh, ngu danh, luu hanh
vanh dai » van dai, vanh tai, lanh dao
hanh dai » hanh tai, hanh dao, thanh dat
va thanh » gia thanh, ban thanh, va tinh
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa
san ky » sang ky, van ky, dan ky
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 xa) or (lang xa)) hoi. hieu va thanh ngu hanh ((hanh dai) OR (vanh dai)) va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu san ky ((nang xa) OR (lang xa)) hoi. hieu va thanh ngu hanh ((hanh dai) OR (vanh dai)) va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu san ky ((nang xa) or (lang xa)) hoi. hieu va thanh ngu hanh ((hanh dai) OR (vanh dai)) va triet".
• Adding a wildcard symbol may retrieve word variants: tu san ky ((nang xa) or (lang xa)) hoi. hieu va thanh ngu hanh ((hanh dai) OR (vanh dai)) va triet*.