Perhaps you should try some spelling variations:
hoang ki » hoang kim, hoang kinh, hoang thi
su triet » su viet, su tien, ve triet
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
cao hoi » cau hoi, co hoi, cao hoc
ve cham » va cham, ve chat, vu cham
xuc van » duc van, luc van, xuc ban
vuc van » duc van, luc van, thuc van
va cam » va cham, va cac, va cao
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: tu sach ky nang cao hoi. hieu ((ve cham) or (va cam)) ((xuc van) OR (vuc van)) hoang ki su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang cao hoi. hieu ((ve cham) OR (va cam)) ((xuc van) OR (vuc van)) hoang ki su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang cao hoi. hieu ((ve cham) or (va cam)) ((xuc van) OR (vuc van)) hoang ki su triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang cao hoi. hieu ((ve cham) or (va cam)) ((xuc van) OR (vuc van)) hoang ki su triet*.