Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
su sach » so sach
dinh de » dinh ve, dinh du, dinh le
van hai » van ha, van chat, van hanh
cao hoi » cau hoi, co hoi, cao hoc
vu sach » vu bach, vu khach
y nang » ky nang, ly nang, v nang
xuc va » duc va, tuc va, xac va
luc va » duc va, tuc va, loc va
de cua » le cua, te cua, dieu cua
cua te » cua tu

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 van hai ((xuc va) OR (luc va)) dinh de cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) y nang cao hoi. hieu van hai ((xuc va) OR (luc va)) dinh de cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (vu sach)) y nang cao hoi. hieu van hai ((xuc va) OR (luc va)) dinh de cua te".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu sach)) y nang cao hoi. hieu van hai ((xuc va) OR (luc va)) dinh de cua te*.