Perhaps you should try some spelling variations:
van hoang » van hoan, quan hoang, tran hoang
su triet » su viet, su tien, ve triet
hoang di » hoang dai, hoang de, hang di
xuc van » duc van, luc van, vuc van
su sach » so sach
vu sach » vu bach, vu khach
cao hoi » cau hoi, co hoi, cao hoc
va cam » va cham, va cac, va cao
y nang » ky nang, ly nang, v nang
ve cam » ve cham, ve cac, ve cai
di su » doi su, ki su, da 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) OR (vu sach)) y nang cao hoi. hieu ((ve cam) or (va cam)) xuc van hoang di su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) y nang cao hoi. hieu ((ve cam) OR (va cam)) xuc van hoang di su triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (vu sach)) y nang cao hoi. hieu ((ve cam) or (va cam)) xuc van hoang di su triet*".