Perhaps you should try some spelling variations:
hanh loai » thanh hoai, thanh loan, phan loai
manh hanh » xanh hanh, danh thanh, minh thanh
cham duc » pham duc, cham soc, phan duc
pham duy » pham duc
hieu van » hieu va, thien van, lieu va
loai ca » loai cay, loai cua, loai va
su sach » so sach, vu sach
ly nang » ky nang, ly hang, ly vang
ca viet » va viet, co viet, hoa viet
y nang » ky nang, v nang, may nang

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