Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
su triet » su viet, su tien, ve triet
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
van cam » van nam, van lam, van cau
va tinh » may tinh
va hanh » van hanh, va thanh, va danh
cam tu » cam thu, nam tu, dam tu
ki su » ky su

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

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