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