Perhaps you should try some spelling variations:
thuat sach » thuat san
thuat lanh » thuat lap, thuat san
van anh » van thanh, van minh
cao suc » cao su, cao duc
hieu ve » hieu va, hieu van
tang ma » mang may, tang van
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa
ve cao » va cao, ve bao, ve cac
y tang » ky tang, 6 tang, 7 tang
di cua » dai cua, doi cua, de cua
tuan » quan, tran, luan

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

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