Perhaps you should try some spelling variations:
qua than » qua thanh, qua phan, qua tan
than soc » than doc, than hoc, than so
va hanh » van hanh, va thanh, va danh
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
te sach » toc sach
soc va » hoc va, loc va, doc va
di cua » dai cua, doi cua, do cua
de cua » le cua, te cua, dieu cua
te sac » te cac, te san

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sac) or (te sach)) ky lang xa hoi. hieu qua than soc va hanh ((di cua) OR (de cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sac) OR (te sach)) ky lang xa hoi. hieu qua than soc va hanh ((di cua) OR (de cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sac) or (te sach)) ky lang xa hoi. hieu qua than soc va hanh ((di cua) OR (de cua)) tre".
• Adding a wildcard symbol may retrieve word variants: ((te sac) or (te sach)) ky lang xa hoi. hieu qua than soc va hanh ((di cua) OR (de cua)) tre*.