Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
duy nhanh » duy khanh, day nhanh, duy anh
day hanh » day nhanh, day thanh, dao hanh
dua tren » dung tren
vu sach » vu bach, su sach, vu khach
cuu tre » cua tre, cau tren, cau treo
sach ky » sac ky, sach y, sach ty
ve pham » vi pham, v pham, ve phan
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma

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 xa hoi. hieu ve pham thuc ((day hanh) or (duy nhanh)) de ((dua tren) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang xa hoi. hieu ve pham thuc ((day hanh) OR (duy nhanh)) de ((dua tren) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang xa hoi. hieu ve pham thuc ((day hanh) or (duy nhanh)) de ((dua tren) or (cuu tre))*.