Perhaps you should try some spelling variations:
thi hoang » thai hoang, thi hang, thi hoan
thanh di » thanh doi, thanh de, thanh do
va thanh » gia thanh, ban thanh, va tinh
thi hong » thi cong, thi phuong, thi hanh
nhan luc » nang luc
hieu van » hieu va, thien van, lieu va
te sach » toc sach
hac luc » than luc
cua tre » cua te, cuu tre, cua triet
di cua » dai cua, doi 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: te sach ((thi hoang) or (thi hong)) xa hoi. hieu van ((hac luc) OR (nhan luc)) va thanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((thi hoang) OR (thi hong)) xa hoi. hieu van ((hac luc) OR (nhan luc)) va thanh di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((thi hoang) or (thi hong)) xa hoi. hieu van ((hac luc) OR (nhan luc)) va thanh di cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ((thi hoang) or (thi hong)) xa hoi. hieu van ((hac luc) OR (nhan luc)) va thanh di cua tre*.