Perhaps you should try some spelling variations:
thanh luu » thanh lieu, thanh ngu, thanh lap
thanh luc » than luc, nhan luc, thanh lap
su triet » su viet, su tien, ve triet
hanh dai » hanh tai, hanh dao, vanh dai
ban hanh » ban hang
tang mai » tang ma, tang tai, lang mai
mai hoi » mai khoi, dai hoi, lai hoi
hieu va » lieu va, hieu qua
sac ky » cac ky
dai su » dai sua, dai so, dan su

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sac ky) or (sai ky)) tang mai hoi. hieu va ((thanh luc) OR (thanh luu)) ban hanh dai su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sac ky) OR (sai ky)) tang mai hoi. hieu va ((thanh luc) OR (thanh luu)) ban hanh dai su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sac ky) or (sai ky)) tang mai hoi. hieu va ((thanh luc) OR (thanh luu)) ban hanh dai su triet".
• Adding a wildcard symbol may retrieve word variants: tu ((sac ky) or (sai ky)) tang mai hoi. hieu va ((thanh luc) OR (thanh luu)) ban hanh dai su triet*.