Perhaps you should try some spelling variations:
thieu nien » thien nhien
hieu viec » nhieu viec, hieu ve, sieu viet
su triet » su viet, su tien, ve triet
hanh ca » hanh cac, hanh cat, hanh cua
sach ky » sac ky, sach y, sach ty
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
tuc va » thuc va, truc va, tuc xa
loc va » hoc va, luc va
ca su » cua su, cao su, ca sau

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 ky nang xa hoi. ((thieu nien) or (hieu viec)) cac ((tuc va) or (loc va)) hanh ca su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang xa hoi. ((thieu nien) OR (hieu viec)) cac ((tuc va) OR (loc va)) hanh ca su triet.
• Adding a wildcard symbol may retrieve word variants: su sach ky nang xa hoi. ((thieu nien) or (hieu viec)) cac ((tuc va) or (loc va)) hanh ca su triet*.