Perhaps you should try some spelling variations:
thien thanh » tien thanh, thi thanh, hien hanh
thien hach » hien hanh
huu thuc » cuu thuc, huu phuc, huu thu
hanh va » hang va, hanh vi
va hanh » van hanh, va thanh, va danh
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
xuc va » duc va, tuc va, luc va
nang o » nang co, nang ho, nang ro
va huu » vu huu
o hai » co hai, so hai, o lai

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 ty nang o hai. chieu ((thien hach) or (thien thanh)) xuc va hanh va huu thuc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang o hai. chieu ((thien hach) OR (thien thanh)) xuc va hanh va huu thuc.
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang o hai. chieu ((thien hach) or (thien thanh)) xuc va hanh va huu thuc*.