Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
su viet » so viet
ve nam » he nam, va nam, le nam
vu cua » hu cua, tu cua
dan va » doan va, dan ca, ban va
tu ca » tu cac, tu cua, tu can

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 nam ((tu ca) or (vu cua)) dan va su viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang xa hoi. hieu ve nam ((tu ca) OR (vu cua)) dan va su viet.
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang xa hoi. hieu ve nam ((tu ca) or (vu cua)) dan va su viet*.