Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
danh vai » danh sai, danh va, doanh van
kham luc » khai luoc, kham cuoc, nhan luc
cuu tre » cua tre, cau treo
va danh » va dinh, va dan, va hanh
tu sach » thu sach, su sach, te sach
hieu vu » hieu va, hieu ve, hieu su
ty hang » ly hang, ty xang, thi hang
ty nang » ky nang, ty xang, ly nang
vu kham » vu khanh
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) or (ty hang)) xa hoi. hieu vu kham luc va danh vai ((cuu tre) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ty nang) OR (ty hang)) xa hoi. hieu vu kham luc va danh vai ((cuu tre) OR (cau tren)).
• Adding a wildcard symbol may retrieve word variants: tu sach ((ty nang) or (ty hang)) xa hoi. hieu vu kham luc va danh vai ((cuu tre) or (cau tren))*.