Perhaps you should try some spelling variations:
thien van » thi van
hanh tai » thanh tai, hang tai, han tai
hanh lai » hanh lam, thanh lap, thanh loi
vu sach » vu bach, su sach, vu khach
van cac » van hac, van cau, van bac
cac duc » cac du, cao duc, cac dac
van hoc » van hoa
van hoi » van hoa, van hoe, van loi
y lang » o lang, _ lang, tay lang
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: vu sach y lang ((van hoi) OR (van hoc)). thien van cac duc va ((hanh lai) or (hanh tai)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach y lang ((van hoi) OR (van hoc)). thien van cac duc va ((hanh lai) OR (hanh tai)) cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach y lang ((van hoi) OR (van hoc)). thien van cac duc va ((hanh lai) or (hanh tai)) cua te".
• Adding a wildcard symbol may retrieve word variants: vu sach y lang ((van hoi) OR (van hoc)). thien van cac duc va ((hanh lai) or (hanh tai)) cua te*.