Perhaps you should try some spelling variations:
thieu bien » thieu nien, tieu bieu, hien bien
bien dat » bien dai, bien dao, bieu dat
van hanh » van thanh, ban hanh, van anh
dang tay » dang xay, dung tay, dan tay
dai cuu » dai cua, dai huu
sach ty » sach tu, sach thu, xach tay
tay hoi » tay ho, tao hoi, tay thai
cuu tre » cua tre, cau tren, cau treo
va dan » ca dan, va dao, va dau

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 ty) or (sach y)) dang tay hoi. thieu bien dat nuoc ((van hanh) or (va dan)) dai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ty) OR (sach y)) dang tay hoi. thieu bien dat nuoc ((van hanh) OR (va dan)) dai cuu tre.
• Adding a wildcard symbol may retrieve word variants: su ((sach ty) or (sach y)) dang tay hoi. thieu bien dat nuoc ((van hanh) or (va dan)) dai cuu tre*.