Perhaps you should try some spelling variations:
hanh truc » hang truc, nhanh thuc, hanh thuoc
hieu van » hieu va, thien van, lieu va
van hanh » van thanh, ban hanh, van anh
dua tren » dung tren
vu sach » vu bach, su sach, vu khach
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: vu sach ky nang ma hoi. hieu van hanh truc va dan vi ((dua tren) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang ma hoi. hieu van hanh truc va dan vi ((dua tren) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang ma hoi. hieu van hanh truc va dan vi ((dua tren) or (cuu tre))*.