Perhaps you should try some spelling variations:
thanh lap » thanh san, phan lap, thanh hai
hanh lai » hanh lam, hanh tai, thanh loi
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
cac tac » cac toc, cac bac, cac dac
cac tuc » cac toc, cac tu, cac nuoc
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
su viet » so viet

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 ty nang xa hoi. lieu va ((cac tuc) OR (cac tac)) va ((hanh lai) or (thanh lap)) su viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang xa hoi. lieu va ((cac tuc) OR (cac tac)) va ((hanh lai) OR (thanh lap)) su viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty nang xa hoi. lieu va ((cac tuc) OR (cac tac)) va ((hanh lai) or (thanh lap)) su viet".
• Adding a wildcard symbol may retrieve word variants: su sach ty nang xa hoi. lieu va ((cac tuc) OR (cac tac)) va ((hanh lai) or (thanh lap)) su viet*.