Perhaps you should try some spelling variations:
truong doi » truong dai, trong doi, truong hoi
xa truong » cac truong
nam thuc » nam thuoc, am thuc, nam thu
hoc sach » hoc sinh, hoc cac, hoc anh
hieu van » hieu va, thien van, lieu va
co sach » bo sach, cuon sach
doi cua » dai cua, hoi cua
cam tuc » cam xuc, cam tu, dam thuc
nang xa » nang x, lang xa, nang ma
tu nang » tru nang, tu nong, tu nano
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((co sach) OR (hoc sach)) tu nang xa hoi. hieu van ((cam tuc) or (nam thuc)) xa truong doi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((co sach) OR (hoc sach)) tu nang xa hoi. hieu van ((cam tuc) OR (nam thuc)) xa truong doi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((co sach) OR (hoc sach)) tu nang xa hoi. hieu van ((cam tuc) or (nam thuc)) xa truong doi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((co sach) OR (hoc sach)) tu nang xa hoi. hieu van ((cam tuc) or (nam thuc)) xa truong doi cua tre*.