Perhaps you should try some spelling variations:
thien van » thi van
doc sach » hoc sach, toc sach, nuoc sach
danh vai » danh sai, danh va, doanh van
tang van » dang van, hoang van, trong van
vai cua » dai cua, hai cua, lai cua
ky tang » ky nang, ky dang, kho tang
van hoc » van hoa
luc va » duc va, tuc va
loc va » hoc va
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: ((doc sach) or (thu hoach)) ky tang van hoc. thien van nam ((luc va) OR (loc va)) danh vai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc sach) OR (thu hoach)) ky tang van hoc. thien van nam ((luc va) OR (loc va)) danh vai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doc sach) or (thu hoach)) ky tang van hoc. thien van nam ((luc va) OR (loc va)) danh vai cua te".
• Adding a wildcard symbol may retrieve word variants: ((doc sach) or (thu hoach)) ky tang van hoc. thien van nam ((luc va) OR (loc va)) danh vai cua te*.