Perhaps you should try some spelling variations:
phan loai » phan lap
nhan loc » nhan luc, nhan hoc, nhan loai
hanh doi » thanh doi, hanh noi, hang doi
su sach » so sach, vu sach
va hanh » van hanh, va thanh, va danh
nang ma » tang ma, sang ma, nang cao
cua tre » cuu tre, cua triet, dua tren
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa
cua te » cua tu

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

• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang ma hoi. hieu qua ((nhan loc) OR (phan loai)) va hanh doi ((cua tre) OR (cua te))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang ma hoi. hieu qua ((nhan loc) or (phan loai)) va hanh doi ((cua tre) OR (cua te))~".
• Adding a wildcard symbol may retrieve word variants: su sach y nang ma hoi. hieu qua ((nhan loc) or (phan loai)) va hanh doi ((cua tre) OR (cua te))*.