Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
cham luc » cham soc, nhan luc, cham cuu
van hanh » ban hanh, van anh, van ban
tu sach » thu sach, su sach, tu cach
vu cham » va cham, vu kham, tu cham
hieu vu » hieu va, hieu ve, hieu su
lang xa » lang ha, dang xay, lang van
te sach » toc sach
su viet » so viet
y lang » o lang, _ lang, tay lang
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) or (te sach)) y lang xa hoi. hieu vu cham luc ((van hanh) or (van thanh)) vi su viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) y lang xa hoi. hieu vu cham luc ((van hanh) OR (van thanh)) vi su viet.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) y lang xa hoi. hieu vu cham luc ((van hanh) or (van thanh)) vi su viet*.