Perhaps you should try some spelling variations:
thien van » thi van
dua tren » dung tren
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
nam soc » nam so, nam moc, nam son
va lang » va nang, hoa lang
lang di » lang dai, hang di, lang du
tu tren » tu truyen, tu tieng, tu trong
soc va » hoc va, loc va, doc va

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