Perhaps you should try some spelling variations:
doc sach » hoc sach, toc sach, nuoc sach
te sach » toc sach
hieu va » lieu va, hieu qua
va tham » van tham, va cham, va thanh
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
xuc va » duc va, luc va, xac va
tuc va » thuc va, truc va, tuc xa
vi cua » vai cua, di cua
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: ((te sach) or (doc sach)) ty nang xa hoi. hieu va tham ((xuc va) OR (tuc va)) hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (doc sach)) ty nang xa hoi. hieu va tham ((xuc va) OR (tuc va)) hanh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (doc sach)) ty nang xa hoi. hieu va tham ((xuc va) OR (tuc va)) hanh vi cua te".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (doc sach)) ty nang xa hoi. hieu va tham ((xuc va) OR (tuc va)) hanh vi cua te*.