Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
danh hai » dang hai, lanh hai, manh hai
nang xa » nang x, lang xa, nang ma
hien tu » khien tu, dien tu
tu chat » tu phat, tu cham, du chat
duoc va » nuoc va, duc va, duoc ma
hai cua » thai cua, dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet
doc va » hoc va, duc va, loc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu sach) or (thu hoach)) ky nang xa hoi. hien tu chat ((doc va) OR (duoc va)) danh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (thu hoach)) ky nang xa hoi. hien tu chat ((doc va) OR (duoc va)) danh hai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) or (thu hoach)) ky nang xa hoi. hien tu chat ((doc va) OR (duoc va)) danh hai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (thu hoach)) ky nang xa hoi. hien tu chat ((doc va) OR (duoc va)) danh hai cua tre*.