Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
dao thi » do thi, dan thi, dang thi
ca tren » cau tren, cu tren, co tren
la tren » loai tren, dua tren, dat tren
xuc va » duc va, tuc va, xac va
luc va » duc va, tuc va, loc 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. lieu va cac ((xuc va) or (luc va)) dao thi ((ca tren) OR (la tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. lieu va cac ((xuc va) OR (luc va)) dao thi ((ca tren) OR (la tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang xa hoi. lieu va cac ((xuc va) or (luc va)) dao thi ((ca tren) OR (la tren))".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. lieu va cac ((xuc va) or (luc va)) dao thi ((ca tren) OR (la tren))*.