Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu viec » nhieu viec, hieu ve, sieu viet
viec bach » vien bach, viec ban, viec bao
nang ma » tang ma, sang ma, mang may
sach ky » sac ky, sach y, sach ty
tuoc va » thuoc va, nuoc va, tuc va
duoc va » nuoc va, duc va, duoc ma
danh de » hanh de, dan de, dang de
vu sach » vu bach, su sach, vu khach
de cua » le cua, te cua, dieu cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ky ((nang ma) OR (nang cao)) hoi. hieu viec bach ((tuoc va) or (duoc va)) danh de cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky ((nang ma) OR (nang cao)) hoi. hieu viec bach ((tuoc va) OR (duoc va)) danh de cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ky ((nang ma) OR (nang cao)) hoi. hieu viec bach ((tuoc va) or (duoc va)) danh de cua triet".
• Adding a wildcard symbol may retrieve word variants: vu sach ky ((nang ma) OR (nang cao)) hoi. hieu viec bach ((tuoc va) or (duoc va)) danh de cua triet*.