Perhaps you should try some spelling variations:
hieu viec » nhieu viec, sieu viet, hieu hien
sach nuoc » sach duoc, cac nuoc, bach tuoc
dung doi » huong doi, dung tai, dung co
cau tren » cu tren, dau tren, ca tren
vu sach » vu bach, su sach, vu khach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
va dung » van dung, va duong, vat dung
doi cau » doi dau, di cau, doi ca
ma hoi » mai hoi, xa hoi, ma hoa

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 ty nang ma hoi. ((hieu viec) or (hieu ve)) sach nuoc va dung doi cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ty nang ma hoi. ((hieu viec) OR (hieu ve)) sach nuoc va dung doi cau tren.
• Adding a wildcard symbol may retrieve word variants: vu sach ty nang ma hoi. ((hieu viec) or (hieu ve)) sach nuoc va dung doi cau tren*.