Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
tay lang » tai lang, tay tang, tay quang
hanh di » hanh vi, hanh de, hang di
hieu va » lieu va, hieu qua
tu sach » thu sach, su sach, te sach
va chat » van chat, va phat, cao chat
ha hoi » hoa hoi, ha noi, xa hoi
y lang » o lang, _ lang, yen lang
xuc va » duc va, luc va, xac va
tuc va » thuc va, truc va, tuc xa
di su » doi su, ki su, da 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 sach ((y lang) or (tay lang)) ha hoi. hieu va chat ((xuc va) OR (tuc va)) hanh di su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((y lang) OR (tay lang)) ha hoi. hieu va chat ((xuc va) OR (tuc va)) hanh di su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((y lang) or (tay lang)) ha hoi. hieu va chat ((xuc va) OR (tuc va)) hanh di su triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ((y lang) or (tay lang)) ha hoi. hieu va chat ((xuc va) OR (tuc va)) hanh di su triet*.