Perhaps you should try some spelling variations:
sach thi » sach thu, sach tai, sach thieu
thi hanh » thi thanh
thuc dan » thuc hanh, hoc dan, thuc vat
hanh lai » hanh lam, hanh tai, thanh lap
va triet » va thiet, va trien, ve triet
tu sach » thu sach, su sach, te sach
hanh xa » hanh va, hanh ma, hanh xu
hieu ve » hieu va, hieu van
ve cam » ve cham, ve cac, va cam
tuc va » thuc va, truc va, tuc xa
lai va » loai va, mai va, dai va

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 thi hanh xa hoi. hieu ve cam ((tuc va) or (thuc dan)) hanh lai va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thi hanh xa hoi. hieu ve cam ((tuc va) OR (thuc dan)) hanh lai va triet.
• Adding a wildcard symbol may retrieve word variants: tu sach thi hanh xa hoi. hieu ve cam ((tuc va) or (thuc dan)) hanh lai va triet*.