Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
ban thanh » ban hanh, ban hang
sach thu » sach thue, sach thieu, sach tham
thu hang » thi hang, thuc hanh, thu huong
hang mai » hoang mai, hang tai, hang hai
su sach » so sach, vu sach
cua tre » cua te, cua triet, dua tren
va hanh » van hanh, va thanh, va danh
va pham » van pham, va phat, va phap
hieu va » lieu va, hieu qua
mai hoi » mai khoi, dai hoi, lai hoi
cuu tre » cau tren, cau treo

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 thu hang mai hoi. hieu va pham thuc ((va hanh) or (ban thanh)) va ((cua tre) OR (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach thu hang mai hoi. hieu va pham thuc ((va hanh) OR (ban thanh)) va ((cua tre) OR (cuu tre))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach thu hang mai hoi. hieu va pham thuc ((va hanh) or (ban thanh)) va ((cua tre) OR (cuu tre))*".