Perhaps you should try some spelling variations:
truc ban » thuc ban, truc dan, truoc bang
truc van » truc va, thuc van, truc dan
ky lang » ky nang, ky dang, ky tang
lang ha » long ha
hieu ve » hieu va, hieu van
hanh de » hanh ve
te sac » te sach, te cac, te san
sac ky » cac ky, sai ky
ve cau » ke cau, va cau, ve cac
ha hoi » hoa hoi, ha noi, xa hoi
thiet » thieu

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