Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
ve cam » ve cham, ve cac, va cam
loc va » luc va
va cau » van cau, va cac, va dau
va chu » va che, va chi

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ty nang xa hoi. hieu ve cam ((loc va) or (hoc va)) hanh ((va cau) or (va chu)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang xa hoi. hieu ve cam ((loc va) OR (hoc va)) hanh ((va cau) OR (va chu)) tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang xa hoi. hieu ve cam ((loc va) or (hoc va)) hanh ((va cau) or (va chu)) tre*.