Perhaps you should try some spelling variations:
phan loai » phan lap
manh phan » mach phan, anh phan, hanh phan
cham duc » pham duc, pham duy, phan duc
hieu van » hieu va, thien van, lieu va
loai ca » loai cay, loai cua, loai va
su sach » so sach
vu sach » vu bach, vu khach
ca viet » va viet, co viet, hoa viet
y nang » ky nang, ly nang, v nang
x hoi » xa hoi, o hoi, x ho

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) OR (vu sach)) y nang x hoi. hieu van ((cham duc) or (cham soc)) manh phan loai ca viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) y nang x hoi. hieu van ((cham duc) OR (cham soc)) manh phan loai ca viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (vu sach)) y nang x hoi. hieu van ((cham duc) or (cham soc)) manh phan loai ca viet".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (vu sach)) y nang x hoi. hieu van ((cham duc) or (cham soc)) manh phan loai ca viet*.