Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
dua tren » dung tren
hieu van » hieu va, thien van, lieu va
sach ty » sach y, sach tu, sach thu
danh ca » dan ca, doanh cua, danh cho
tu sach » thu sach, su sach, te sach
van cac » van hac, van cau, van bac
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
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 ty nang xa hoi. hieu van cac ((xuc va) or (luc va)) danh ca ((dua tren) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang xa hoi. hieu van cac ((xuc va) OR (luc va)) danh ca ((dua tren) OR (cau tren)).
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang xa hoi. hieu van cac ((xuc va) or (luc va)) danh ca ((dua tren) or (cau tren))*.