Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
hoang di » hoang dai, hoang de, hoang da
xuc van » duc van, luc van, vuc van
hang di » hang doi, hang vi, hang dien
su sach » so sach, vu sach
cao hoi » cau hoi, co hoi, cao hoc
y nang » ky nang, ly nang, v nang
ve cam » ve cham, ve cac, ve cai
va cam » va cham, va cac, va cao

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 y nang cao hoi. hieu ((ve cam) or (va cam)) xuc van ((hoang di) OR (hang di)) su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang cao hoi. hieu ((ve cam) OR (va cam)) xuc van ((hoang di) OR (hang di)) su triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang cao hoi. hieu ((ve cam) or (va cam)) xuc van ((hoang di) OR (hang di)) su triet*".