Perhaps you should try some spelling variations:
phan chuc » pham chuc, phan khuc, phan thuc
thu nang » thi nang, thu hang, thu bang
nang mai » nang ma, nang tai, lang mai
van hanh » van thanh, ban hanh, van anh
bo sach » co sach, hoc sach
vai cua » dai cua, hai cua, lai cua
va hanh » va thanh, va danh, ban hanh
hieu ve » hieu va, hieu van
ve phan » va phan, ke phan, ve phat
mai hoi » mai khoi, dai hoi, lai hoi
so sanh » do sanh
cua te » cua tu

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

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