Perhaps you should try some spelling variations:
thien hach » thien thanh
hien hanh » dieu hanh
tuoc va » thuoc va, nuoc va, duoc va
sach ky » sac ky, sach y, sach ty
su sach » so sach, vu sach
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
cuu tre » cua tre, cau tren, cau treo
va dan » ca dan, va dao, va dau
dan du » dan dau, danh du, dan su
du cuu » tu cuu

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 ky ((nang xa) OR (nang ma)) hoi. hieu ((hien hanh) or (thien hach)) tuoc va dan du cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((nang xa) OR (nang ma)) hoi. hieu ((hien hanh) OR (thien hach)) tuoc va dan du cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky ((nang xa) OR (nang ma)) hoi. hieu ((hien hanh) or (thien hach)) tuoc va dan du cuu tre".
• Adding a wildcard symbol may retrieve word variants: su sach ky ((nang xa) OR (nang ma)) hoi. hieu ((hien hanh) or (thien hach)) tuoc va dan du cuu tre*.