Perhaps you should try some spelling variations:
hieu viec » nhieu viec, sieu viet, hieu hien
sach nuoc » sach duoc, cac nuoc, bach tuoc
hieu van » hieu va, thien van, lieu va
kinh doi » tinh doi, kinh do, kinh doc
su sach » so sach, vu sach
doi cua » dai cua, hoi cua
va kinh » va tinh, qua kinh
hieu ve » hieu va
sach ty » sach y, sach tu, sach thu
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
cua tre » cua te, cuu tre, cua triet

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. ((((hieu viec) or (hieu ve))) or (hieu van)) sach nuoc va kinh doi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang xa hoi. ((((hieu viec) OR (hieu ve))) OR (hieu van)) sach nuoc va kinh doi cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach ty nang xa hoi. ((((hieu viec) or (hieu ve))) or (hieu van)) sach nuoc va kinh doi cua tre*.