Perhaps you should try some spelling variations:
thang duc » than duc, dang duc, hong duc
ke thang » ke trang, le thang, ke thuong
va thanh » gia thanh, ban thanh, va tinh
su triet » su viet, su tien, ve triet
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
hieu ke » hieu kem, chieu ke, hieu ky
va hanh » van hanh, va danh, ban hanh
x hoi » xa hoi, o hoi, x ho
vi su » va su, ve su, ki su

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 x hoi. hieu ke thang duc ((va hanh) or (va thanh)) vi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang x hoi. hieu ke thang duc ((va hanh) OR (va thanh)) vi su triet.
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang x hoi. hieu ke thang duc ((va hanh) or (va thanh)) vi su triet*.