Perhaps you should try some spelling variations:
cau tren » dau tren, ca tren, cau treo
xuc ngan » luc ngan, luc nganh, vu ngan
cham xuc » cam xuc, chat xuc, cham soc
tu sach » thu sach, su sach, te sach
ve cham » va cham, ve chat, vu cham
sach ty » sach y, sach tu, sach thu
hieu ve » hieu va, hieu van
cu tren » tu tren, dua tren
ty nang » ky nang, ty xang, ty hang
o hoi » co hoi, o hoc, o hai
x hoi » xa hoi, x ho, 5 hoi
hang » dang, bang, hanh

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 ((x hoi) OR (o hoi)). hieu ve cham xuc ngan hang va ((cau tren) or (cu tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang ((x hoi) OR (o hoi)). hieu ve cham xuc ngan hang va ((cau tren) OR (cu tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang ((x hoi) OR (o hoi)). hieu ve cham xuc ngan hang va ((cau tren) or (cu tren))".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang ((x hoi) OR (o hoi)). hieu ve cham xuc ngan hang va ((cau tren) or (cu tren))*.