Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
nang tai » hang tai, tang tai, nang cao
sang tai » hang tai, sang tao, tang tai
manh hoi » manh hai, manh ho, manh hon
va manh » van manh, va danh, va hanh
cua tre » cuu tre, cua triet, dua tren
van coc » van hoc, van loc, van co
su sac » su sach, su cac, su xac
luc va » duc va, tuc va, loc va
sac ky » cac ky, sai ky
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sac ky ((nang tai) OR (sang tai)) hoi. hieu van coc luc va manh hoi ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky ((nang tai) OR (sang tai)) hoi. hieu van coc luc va manh hoi ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ky ((nang tai) OR (sang tai)) hoi. hieu van coc luc va manh hoi ((cua tre) or (cua te))".
• Adding a wildcard symbol may retrieve word variants: su sac ky ((nang tai) OR (sang tai)) hoi. hieu van coc luc va manh hoi ((cua tre) or (cua te))*.