Perhaps you should try some spelling variations:
sang mai » sang ma, sang tai, lang mai
cau phuc » chau phu, huu phuc, van phuc
ban hanh » ban hang
su sach » so sach, vu sach
sach lo » sach dao, sach doi, sach hoi
lo sang » lam sang, luc sang, cao sang
mai hoi » mai khoi, dai hoi, lai hoi
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
vi va » vi van, vai va, vu 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: su sach lo sang mai hoi. hieu va ((cau phuc) or (cau truc)) ((va hanh) or (ban hanh)) vi va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach lo sang mai hoi. hieu va ((cau phuc) OR (cau truc)) ((va hanh) OR (ban hanh)) vi va thiet.
• Adding a wildcard symbol may retrieve word variants: su sach lo sang mai hoi. hieu va ((cau phuc) or (cau truc)) ((va hanh) or (ban hanh)) vi va thiet*.