Perhaps you should try some spelling variations:
hanh tai » thanh tai, hang tai, han tai
hanh van » thanh van, khanh van, hanh va
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
xac va » tac va, ac va, bac va
tuc va » thuc va, truc va, tuc xa
ve cac » va cac, vien cac
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 cac ((xac va) or (tuc va)) ((hanh van) or (hanh tai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ma hoi. hieu ve cac ((xac va) OR (tuc va)) ((hanh van) OR (hanh tai)) cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ma hoi. hieu ve cac ((xac va) or (tuc va)) ((hanh van) or (hanh tai)) cua tre*.