Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
dua tren » dung tren
dan hanh » dang hanh, dan khanh, dan thanh
duoc dan » duc dan, duoc ban, duoc dai
su triet » su viet, su tien, ve triet
hieu ve » hieu va, hieu van
ma hoi » mai hoi, xa hoi, ma hoa
y nang » ky nang, ly nang, may nang
ve tao » ve bao, de tao, ve tac
v nang » va nang, vu nang, van nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach ((y nang) or (v nang)) ma hoi. hieu ve tao duoc dan hanh vi ((dua tren) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ((y nang) OR (v nang)) ma hoi. hieu ve tao duoc dan hanh vi ((dua tren) OR (su triet)).
• Adding a wildcard symbol may retrieve word variants: thuat sach ((y nang) or (v nang)) ma hoi. hieu ve tao duoc dan hanh vi ((dua tren) or (su triet))*.