Perhaps you should try some spelling variations:
chieu thien » chieu chien, hieu hien
thien hach » thien thanh, hien hanh
toc sach » hoc sach, doc sach, thuoc sach
hach duc » thach duc, hanh duoc, sach duoc
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang ho » nang hoc, nang co, tang ho
va hanh » van hanh, va thanh, va danh
ho hoi » hoc hoi, hoa hoi, hoi hoi
vu huu » vu huy, tu huu

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ty nang ho hoi. chieu thien hach duc va hanh ((va huu) or (vu huu)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ty nang ho hoi. chieu thien hach duc va hanh ((va huu) OR (vu huu)) tre.
• Adding a wildcard symbol may retrieve word variants: toc sach ty nang ho hoi. chieu thien hach duc va hanh ((va huu) or (vu huu)) tre*.