Perhaps you should try some spelling variations:
truc van » truc va, thuc van, truc ban
cua viet » ca viet, hoa viet, cua vat
ky lang » ky dang, ky tang, tay lang
hieu ve » hieu va, hieu van
te sac » te sach, te cac, te san
ha hoi » hoa hoi, ha noi, xa hoi
ve cau » ke cau, va cau, ve cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sac ((ky lang) OR (ky nang)) ha hoi. hieu ve cau truc van ((hanh kem) or (hanh vi)) cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ((ky lang) OR (ky nang)) ha hoi. hieu ve cau truc van ((hanh kem) OR (hanh vi)) cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac ((ky lang) OR (ky nang)) ha hoi. hieu ve cau truc van ((hanh kem) or (hanh vi)) cua viet".
• Adding a wildcard symbol may retrieve word variants: te sac ((ky lang) OR (ky nang)) ha hoi. hieu ve cau truc van ((hanh kem) or (hanh vi)) cua viet*.