Perhaps you should try some spelling variations:
thien van » thi van
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
va lang » va nang, hoa lang
moc va » hoc va, loc va, doc va
de cua » le cua, te cua, dieu cua
di du » li du

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 ky nang xa hoi. thien van nam moc va lang ((di du) or (de cua)) tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. thien van nam moc va lang ((di du) OR (de cua)) tren.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. thien van nam moc va lang ((di du) or (de cua)) tren*.