Perhaps you should try some spelling variations:
doanh chien » doan thien, hoach chien, khanh chien
vay doanh » van doanh, ly doanh, voi doanh
pham thuc » phap thuc, pham chuc, nham thuc
thuc vay » thuc vat, thuc day, thuc va
doc sach » hoc sach, toc sach, nuoc sach
va pham » van pham, va phat, va phap
hieu va » lieu va, hieu qua
sach ky » sac ky, sach y, sach ty
nang o » nang co, nang ho, nang ro
o hoi » co hoi, o hoc, o hai
tu le » vu le
tu tu » su tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc sach ky nang o hoi. hieu va pham thuc vay doanh chien ((((tu te) or (tu le))) or (tu tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc sach ky nang o hoi. hieu va pham thuc vay doanh chien ((((tu te) OR (tu le))) OR (tu tu)).
• Adding a wildcard symbol may retrieve word variants: doc sach ky nang o hoi. hieu va pham thuc vay doanh chien ((((tu te) or (tu le))) or (tu tu))*.