Perhaps you should try some spelling variations:
viec bach » vien bach, viec ban, viec bao
hieu viec » nhieu viec, hieu ve, sieu viet
mai khoa » tai khoa, may khoa, dai khoa
hanh hai » thanh hai, nhanh hai, hang hai
cua viet » ca viet, hoa viet, cua vat
nang mai » nang ma, nang tai, lang mai
tu nang » tru nang, tu nong, tu nano
te sach » toc sach
hai cua » thai cua, dai cua, hoi cua
tu sach » thu sach, su sach, tu cach
xuc va » duc va, luc va, xac va
tuc va » thuc va, truc va, tuc xa

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (te sach)) tu nang mai khoa. hieu viec bach ((xuc va) or (tuc va)) hanh hai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) tu nang mai khoa. hieu viec bach ((xuc va) OR (tuc va)) hanh hai cua viet.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) tu nang mai khoa. hieu viec bach ((xuc va) or (tuc va)) hanh hai cua viet*.