Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
hanh tai » thanh tai, hang tai, han tai
dua tren » dung tren
van hanh » van thanh, ban hanh, van anh
hieu ve » hieu va, hieu van
cam luc » cam xuc, cau luc
luc van » luoc van, luu van, duc van
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
tu sach » thu sach, su sach, te sach
ve cam » ve cham, ve cac, va cam
x hoi » xa hoi, o hoi, x ho

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