Perhaps you should try some spelling variations:
pham luan » phap luan, pham quang, pham van
toc sach » hoc sach, doc sach, thuoc sach
qua pham » quan pham, quy pham, qua cham
van hanh » van thanh, ban hanh, van anh
va thanh » gia thanh, ban thanh, va tinh
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
va hanh » va danh, ban hanh, dao hanh
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ky nang xa hoi. hieu qua pham luan ((((va hanh) OR (van hanh))) or (va thanh)) vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky nang xa hoi. hieu qua pham luan ((((va hanh) OR (van hanh))) OR (va thanh)) vi cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky nang xa hoi. hieu qua pham luan ((((va hanh) OR (van hanh))) or (va thanh)) vi cua tre*".