Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
day nhanh » day thanh, duy nhanh, dac nhan
cau treo » cau theo, cau tren, cau triet
day manh » van manh, duc manh, ha manh
ve pham » vi pham, v pham, ve phan
hieu ve » hieu va, hieu van
sach ty » sach y, sach tu, sach thu
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
cua tre » cua te, cuu tre, cua triet
vu sach » vu bach, su sach, vu khach

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