Perhaps you should try some spelling variations:
cam thuy » cam thu, pham thuy, am thuc
thuy van » thuy san, thuc van, chu van
khang vi » khang voi, hang vi, hang va
khang di » hang di, khang voi, hang doi
te sach » toc sach
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
so sanh » do sanh
cu tren » tu tren, dua tren
ve cam » ve cham, ve cac, va cam

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) or (so sanh)) ky nang xa hoi. hieu ve cam thuy van ((khang di) OR (khang vi)) cu tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (so sanh)) ky nang xa hoi. hieu ve cam thuy van ((khang di) OR (khang vi)) cu tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (so sanh)) ky nang xa hoi. hieu ve cam thuy van ((khang di) OR (khang vi)) cu tren".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (so sanh)) ky nang xa hoi. hieu ve cam thuy van ((khang di) OR (khang vi)) cu tren*.