Perhaps you should try some spelling variations:
thuc dan » thuc hanh, hoc dan, thuc vat
hanh vai » hanh vi, hanh va, hanh tai
su sach » so sach, vu sach
vai cua » dai cua, hai cua, lai cua
sach ky » sac ky, sach y, sach ty
van cau » van dau, van hau, van chat
van cac » van hac, van bac, dan cac
nang xa » nang x, lang xa, nang ma
luc va » duc va, tuc va, loc va
cua tu » cua tuc, cua su, cua cu

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. hieu ((van cac) OR (van cau)) ((luc va) or (thuc dan)) hanh vai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang xa hoi. hieu ((van cac) OR (van cau)) ((luc va) OR (thuc dan)) hanh vai cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang xa hoi. hieu ((van cac) OR (van cau)) ((luc va) or (thuc dan)) hanh vai cua tu".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang xa hoi. hieu ((van cac) OR (van cau)) ((luc va) or (thuc dan)) hanh vai cua tu*.