Perhaps you should try some spelling variations:
thuat lanh » thuat lap, thuat san
doanh van » doan van, doanh va, doanh ban
nam duoc » nam thuoc, da duoc, dat duoc
danh vai » danh sai, danh va, dang van
duoc va » nuoc va, duc va, duoc ma
tu sach » thu sach, su sach, te sach
thi van » thi lan, thi hanh, thi nang
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet

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

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