Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
thu sach » tu sach, thuat sach, thu hoach
hanh tai » thanh tai, hang tai, han tai
hieu van » hieu va, thien van, lieu va
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
van cac » van hac, van cau, van bac
tai cua » thai cua, tai cuc, tri cua
xuc va » tuc va, luc va, xac va
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu sach) OR (thuoc sach)) ty nang xa hoi. hieu van cac ((xuc va) or (duc va)) hanh tai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (thuoc sach)) ty nang xa hoi. hieu van cac ((xuc va) OR (duc va)) hanh tai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) OR (thuoc sach)) ty nang xa hoi. hieu van cac ((xuc va) or (duc va)) hanh tai cua te".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) OR (thuoc sach)) ty nang xa hoi. hieu van cac ((xuc va) or (duc va)) hanh tai cua te*.