Perhaps you should try some spelling variations:
van hanh » van thanh, van anh, van ban
ban hanh » ban hang
tu sach » thu sach, su sach, te sach
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu vu » hieu va, hieu ve, hieu su
vu cham » va cham, vu kham, tu cham
tu sac » tu cac, tu san, tu bac
vi cua » vai cua, di cua
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sac) or (tu sach)) ky lang xa hoi. hieu vu cham soc ((van hanh) or (ban hanh)) vi cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sac) OR (tu sach)) ky lang xa hoi. hieu vu cham soc ((van hanh) OR (ban hanh)) vi cua tu.
• Adding a wildcard symbol may retrieve word variants: ((tu sac) or (tu sach)) ky lang xa hoi. hieu vu cham soc ((van hanh) or (ban hanh)) vi cua tu*.