Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
dung tren » dung trong, dung trung
hanh tai » thanh tai, hang tai, han tai
van hanh » van thanh, ban hanh, van anh
sach ty » sach y, sach tu, sach thu
tu sach » thu sach, su sach, te sach
cam luc » cam xuc, cau luc
hieu ve » hieu va, hieu van
ty nang » ky nang, ty xang, ty hang
luc van » luoc van, luu van, duc van
ve cam » ve cham, ve cac, va cam
nang o » nang co, nang ho, nang ro
o hoi » co hoi, o hoc, o hai

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 o hoi. hieu ve cam luc van hanh tai ((((dua tren) or (dung tren))) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang o hoi. hieu ve cam luc van hanh tai ((((dua tren) OR (dung tren))) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang o hoi. hieu ve cam luc van hanh tai ((((dua tren) or (dung tren))) or (cua triet))*.