Perhaps you should try some spelling variations:
thuat lanh » thuat lap, thuat san
doanh van » doan van, doanh va, doanh ban
duc manh » suc manh, duc anh, duc minh
anh van » anh va, thanh van, khanh van
cua tre » cua te, cuu tre, cua triet
tang xa » trang xa, tang ma, lang xa
lanh y » anh y, hanh y, lanh lay
ve dao » va dao, ve bao, te dao
y tang » ky tang, 6 tang, 7 tang

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat lanh y tang xa hoi. hieu ((ve dao) or (de dao)) duc manh ((anh van) OR (doanh van)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat lanh y tang xa hoi. hieu ((ve dao) OR (de dao)) duc manh ((anh van) OR (doanh van)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat lanh y tang xa hoi. hieu ((ve dao) or (de dao)) duc manh ((anh van) OR (doanh van)) cua tre".
• Adding a wildcard symbol may retrieve word variants: thuat lanh y tang xa hoi. hieu ((ve dao) or (de dao)) duc manh ((anh van) OR (doanh van)) cua tre*.