Perhaps you should try some spelling variations:
tham hoc » thai hoc, tham hoa, thao hoc
than hoc » toan hoc, thai hoc, than doc
thanh te » thanh ve, thanh de, thanh le
ky lang » ky dang, ky tang, tay lang
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
ve cac » va cac, vien cac
te cua » tue cua, le cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ve cac ((ky lang) or (ky nang)) xa hoi. hieu va ((tham hoc) OR (than hoc)) gia thanh te cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ve cac ((ky lang) OR (ky nang)) xa hoi. hieu va ((tham hoc) OR (than hoc)) gia thanh te cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ve cac ((ky lang) or (ky nang)) xa hoi. hieu va ((tham hoc) OR (than hoc)) gia thanh te cua tre".
• Adding a wildcard symbol may retrieve word variants: ve cac ((ky lang) or (ky nang)) xa hoi. hieu va ((tham hoc) OR (than hoc)) gia thanh te cua tre*.