Perhaps you should try some spelling variations:
thu nang » thi nang, thu hang, thu bang
pham huu » pham duc, pham duy, phan huy
sach thu » sach thue, sach thieu, sach tham
van hanh » van thanh, ban hanh, van anh
so sach » so sanh, bo sach, co sach
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
va pham » van pham, va phat, va phap
va hanh » va thanh, va danh, ban hanh
ma hoi » mai hoi, xa hoi, ma hoa
cua tu » cua tuc, cua su, cua cu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: so sach thu nang ma hoi. hieu va pham huu ((va hanh) or (van hanh)) lai ((cua te) or (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach thu nang ma hoi. hieu va pham huu ((va hanh) OR (van hanh)) lai ((cua te) OR (cua tu)).
• Adding a wildcard symbol may retrieve word variants: so sach thu nang ma hoi. hieu va pham huu ((va hanh) or (van hanh)) lai ((cua te) or (cua tu))*.