Perhaps you should try some spelling variations:
thien van » thi van
hieu van » hieu va, lieu va, hieu ve
toc sac » toc sach, toc san, hoc sach
ky dang » ky nang, ky danh
dang xa » dang xay, lang xa, dang ha
han tai » hang tai, nhan tai, van tai
sac ky » cac ky, sai ky
tuc va » thuc va, truc va, duc va
cuc te » cua te, cuc thue, cuc tieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sac ky dang xa hoi. ((hieu van) OR (thien van)) nam ((tuc va) or (tuc xa)) han tai cuc te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sac ky dang xa hoi. ((hieu van) OR (thien van)) nam ((tuc va) OR (tuc xa)) han tai cuc te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sac ky dang xa hoi. ((hieu van) OR (thien van)) nam ((tuc va) or (tuc xa)) han tai cuc te".
• Adding a wildcard symbol may retrieve word variants: toc sac ky dang xa hoi. ((hieu van) OR (thien van)) nam ((tuc va) or (tuc xa)) han tai cuc te*.