Perhaps you should try some spelling variations:
thanh truc » thanh trung, thanh thuy, thanh tra
van thanh » ban thanh, van tuan
dung tren » dung trong, dung trung
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
truc va » thuc va, thuc vat, trung va
cuu tre » cua tre, cau tren, cau treo
ma hoi » mai hoi, xa hoi, ma hoa
va dan » ca dan, va dao, va dau
dan vi » doan vi, don vi, dan va

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 ma hoi. hieu van thanh truc va dan vi ((dung tren) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ma hoi. hieu van thanh truc va dan vi ((dung tren) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: su sach ky nang ma hoi. hieu van thanh truc va dan vi ((dung tren) or (cuu tre))*.