Perhaps you should try some spelling variations:
thieu nang » thien nang, thieu khang, thieu quang
te sach » toc sach
ha dong » hoat dong, van dong
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va cham » va chat, va tham
cua tu » cua tuc, cua su, cua cu
luc va » duc va, tuc va, loc va
xac va » tac va, ac va, bac va

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach thieu nang xa hoi. hieu va cham ((xac va) or (luc va)) ha dong ((cua te) OR (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach thieu nang xa hoi. hieu va cham ((xac va) OR (luc va)) ha dong ((cua te) OR (cua tu)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach thieu nang xa hoi. hieu va cham ((xac va) or (luc va)) ha dong ((cua te) OR (cua tu))".
• Adding a wildcard symbol may retrieve word variants: te sach thieu nang xa hoi. hieu va cham ((xac va) or (luc va)) ha dong ((cua te) OR (cua tu))*.