Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
va thanh » gia thanh, ban thanh, va tinh
cham xuc » cam xuc, chat xuc, cham soc
hieu ve » hieu van
hieu va » lieu va, hieu qua
va kinh » va tinh, qua kinh
tang ma » mang may, tang van
su sach » so sach, vu sach
y tang » ky tang, 6 tang, 7 tang
hai su » hai vu, lai su, hai so

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach y tang ma hoa. ((hieu ve) OR (hieu va)) cham xuc ((va thanh) or (va kinh)) hai su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y tang ma hoa. ((hieu ve) OR (hieu va)) cham xuc ((va thanh) OR (va kinh)) hai su triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y tang ma hoa. ((hieu ve) OR (hieu va)) cham xuc ((va thanh) or (va kinh)) hai su triet*".