Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
truc van » truc va, thuc van, truc ban
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
hanh va » hang va, hanh vi
va cham » va chat, va tham
ve cham » ve chat, vu cham, ve chim
nang ma » tang ma, sang ma, nang cao
ty nang » ky nang, ty xang, ty hang
cau tre » cau tren, cau treo, cau tra
ve cai » va cai, ve cac, ve tai
ma hoi » mai hoi, xa hoi, ma hoa
va cau » van cau, va cac, va dau

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ty nang ma hoi. hieu ((ve cai) or (((ve cham) or (va cham)))) truc van hanh va cau tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang ma hoi. hieu ((ve cai) OR (((ve cham) OR (va cham)))) truc van hanh va cau tre.
• Adding a wildcard symbol may retrieve word variants: su sach ty nang ma hoi. hieu ((ve cai) or (((ve cham) or (va cham)))) truc van hanh va cau tre*.