Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
cua tre » cua te, cuu tre, cua triet
xuc van » duc van, luc van, xuc ban
cu tren » tu tren, dua tren
nang ma » tang ma, sang ma, nang cao
ve cam » ve cham, ve cac, ve cai
va cam » va cham, va cac, va cao
ma hoi » mai hoi, xa hoi, ma hoa

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 ky nang ma hoi. hieu ((ve cam) or (va cam)) xuc van hanh vi ((cua tre) or (cu tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ma hoi. hieu ((ve cam) OR (va cam)) xuc van hanh vi ((cua tre) OR (cu tren)).
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ma hoi. hieu ((ve cam) or (va cam)) xuc van hanh vi ((cua tre) or (cu tren))*.