Perhaps you should try some spelling variations:
thien hach » thien thanh, hien hanh
hieu thien » hieu hien, chieu chien, dieu khien
dinh duc » minh duc, ninh duc, tinh duc
su sach » so sach, vu sach
duoc va » nuoc va, duc va, duoc ma
dinh du » dinh cu, dinh tu, dinh dung
cua tre » cua te, cuu tre, cua triet
nang ma » tang ma, sang ma, nang cao
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa
tuc va » thuc va, truc va, tuc xa

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 y nang ma hoi. hieu thien hach ((tuc va) or (duoc va)) ((dinh du) or (dinh duc)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang ma hoi. hieu thien hach ((tuc va) OR (duoc va)) ((dinh du) OR (dinh duc)) cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach y nang ma hoi. hieu thien hach ((tuc va) or (duoc va)) ((dinh du) or (dinh duc)) cua tre*.