Perhaps you should try some spelling variations:
sach thuc » sach thu, sach thue, sach truc
cach thuc » anh thuc, cac thu
hanh lam » thanh lap, hanh kem, hanh va
va trien » va truyen, va thiet, va tuyen
hanh xa » hanh va, hanh ma, hanh xu
hieu ve » hieu va, hieu van
ve cac » va cac, vien cac
luc va » tuc va, loc va
lam va » nam va, dam va, lam ha

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 thuc) or (cach thuc)) hanh xa hoi. hieu ve cac ((luc va) or (duc va)) hanh lam va trien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach thuc) OR (cach thuc)) hanh xa hoi. hieu ve cac ((luc va) OR (duc va)) hanh lam va trien.
• Adding a wildcard symbol may retrieve word variants: tu ((sach thuc) or (cach thuc)) hanh xa hoi. hieu ve cac ((luc va) or (duc va)) hanh lam va trien*.