Perhaps you should try some spelling variations:
sach tai » sach bai, sach tham, sach dao
tai hang » thai hang, thi hang, tai lang
cam thuc » nam thuc, cam thu, can thuc
hanh dao » lanh dao, thanh dat, thanh dam
tu sach » thu sach, su sach, te sach
hang xa » hoang xa, hang va, hang ca
hieu ve » hieu va, hieu van
va hanh » van hanh, va thanh, va danh
su viet » so viet
dao su » dao suu, dan su, cao su

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 tai hang xa hoi. hieu ve ((cam thuc) or (am thuc)) va hanh dao su viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach tai hang xa hoi. hieu ve ((cam thuc) OR (am thuc)) va hanh dao su viet.
• Adding a wildcard symbol may retrieve word variants: tu sach tai hang xa hoi. hieu ve ((cam thuc) or (am thuc)) va hanh dao su viet*.