Perhaps you should try some spelling variations:
dua tren » dung tren
tu sach » thu sach, su sach, te sach
mai hoi » mai khoi, dai hoi, lai hoi
cau luc » cau truc, cau phuc
va hanh » van hanh, va thanh, va danh
y nang » ky nang, ly nang, may nang
v nang » va nang, vu nang, van nang
vi dua » vi du, vi dum, vi lua

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 ((y nang) or (v nang)) mai hoi. lieu va ((cau luc) or (cam xuc)) va hanh vi dua tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((y nang) OR (v nang)) mai hoi. lieu va ((cau luc) OR (cam xuc)) va hanh vi dua tren.
• Adding a wildcard symbol may retrieve word variants: tu sach ((y nang) or (v nang)) mai hoi. lieu va ((cau luc) or (cam xuc)) va hanh vi dua tren*.