Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
tinh lap » trinh lap, tinh lao, dinh lap
thi hanh » thi thanh
va tinh » may tinh
dam tuc » dam thuc, dao tuc, nam thuc
tu sach » thu sach, su sach, tu cach
hanh xa » hanh va, hanh ma, hanh xu
te sach » toc sach
dam tu » nam tu, cam tu, tam tu
lap va » tap va
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: ((tu sach) or (te sach)) thi hanh xa hoi. hieu van ((dam tuc) or (dam tu)) va tinh lap va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) thi hanh xa hoi. hieu van ((dam tuc) OR (dam tu)) va tinh lap va thiet.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) thi hanh xa hoi. hieu van ((dam tuc) or (dam tu)) va tinh lap va thiet*.