Perhaps you should try some spelling variations:
qua pham » quan pham, quy pham, qua cham
duc tuan » duc thuan, duc tan, duc toan
toc sac » toc sach, toc san, hoc sach
nang xa » nang x, lang xa, nang ma
su viet » so viet
sac ky » cac ky, sai ky
anh vi » hanh vi, anh va, anh ve
vi su » va su, ve su, ki su

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sac ky nang xa hoi. hieu qua pham duc tuan anh vi su viet~.
• Adding a wildcard symbol may retrieve word variants: toc sac ky nang xa hoi. hieu qua pham duc tuan anh vi su viet*.