Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
hanh lai » hanh lam, hanh tai, thanh lap
van hanh » van thanh, ban hanh, van anh
pham duy » pham duc
dang xay » dang van, van xay
cham duc » pham duc, cham soc, phan duc
sach tu » sach thu, sach ty, sach uu
xay hoi » xa hoi, tay hoi, cay phoi
cach tu » cach thuc
hieu ve » hieu va, hieu van

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sach tu) OR (cach tu)) dang xay hoi. hieu ve ((cham duc) or (pham duy)) van hanh lai su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach tu) OR (cach tu)) dang xay hoi. hieu ve ((cham duc) OR (pham duy)) van hanh lai su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach tu) OR (cach tu)) dang xay hoi. hieu ve ((cham duc) or (pham duy)) van hanh lai su triet".
• Adding a wildcard symbol may retrieve word variants: te ((sach tu) OR (cach tu)) dang xay hoi. hieu ve ((cham duc) or (pham duy)) van hanh lai su triet*.