Perhaps you should try some spelling variations:
dua tren » dung tren
thu sach » tu sach, thuat sach, thuoc sach
van hanh » van thanh, ban hanh, van anh
thuc van » thuc vat, thuc dan, thuc va
nam thuc » nam thuoc, am thuc, nam thu
su sach » so sach, vu sach
cuu tre » cua tre, cau tren, cau treo
hieu le » hieu ve, hieu he, hieu ly
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa
le nam » ly nam, he nam, le na

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) or (thu sach)) ky nang ma hoi. hieu le nam thuc van hanh vi ((dua tren) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (thu sach)) ky nang ma hoi. hieu le nam thuc van hanh vi ((dua tren) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (thu sach)) ky nang ma hoi. hieu le nam thuc van hanh vi ((dua tren) or (cuu tre))*.