Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
thien van » thi van
thu sach » thuat sach, thu hoach, khau sach
tu sach » su sach, te sach, tu cach
nang xa » nang x, lang xa, nang ma
nam loc » nam lo, nam moc, nam soc
va hang » van hang, va nang, va lang
hang di » hang doi, hang vi, hang dien
cu tren » tu tren, dua tren
loc va » hoc va, luc va
di cu » di cau, di cua, di du

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (((thu sach) OR (thuoc sach)))) ky nang xa hoi. thien van nam loc va hang di cu tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (((thu sach) OR (thuoc sach)))) ky nang xa hoi. thien van nam loc va hang di cu tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (((thu sach) OR (thuoc sach)))) ky nang xa hoi. thien van nam loc va hang di cu tren".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (((thu sach) OR (thuoc sach)))) ky nang xa hoi. thien van nam loc va hang di cu tren*.