Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
van thanh » ban thanh, van tuan
viec cac » viec cua, viec lam, viec va
vien cac » vien bach, vien dai, vien da
thanh va » thanh van, hanh va, thanh ha
su triet » su viet, su tien, ve triet
sach ky » sac ky, sach y, sach ty
lo van » le van, vo van, so van

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach ky nang x ho. hieu ((viec cac) or (vien cac)) lo van thanh va su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ky nang x ho. hieu ((viec cac) OR (vien cac)) lo van thanh va su triet.
• Adding a wildcard symbol may retrieve word variants: thuat sach ky nang x ho. hieu ((viec cac) or (vien cac)) lo van thanh va su triet*.